Christos Koukouvinos

132 papers B 3C 1Journal 121Unranked 7
YearRankTypeTitle / Venue / Authors
2025 J jnl
Closed-form expressions of the run-length distribution of the nonparametric double sampling precedence monitoring scheme.
Comput. Stat.
Zwelakhe Magagula, Jean-Claude Malela-Majika, Schalk William Human, Philippe Castagliola, Kashinath Chatterjee, Christos Koukouvinos
2025 J jnl
On the performance and comparison of various memory-type control charts.
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2024 J jnl
A joint monitoring of the process mean and variance with a generally weighted moving average maximum control chart.
Commun. Stat. Simul. Comput.
Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa, Paraskevi Roupa
2024 J jnl
Monitoring process mean and variability with one triple EWMA chart.
Commun. Stat. Simul. Comput.
Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2023 J jnl
A generally weighted moving average
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2023 J jnl
Krylov subspace solvers for ℓ1 regularized logistic regression method.
Commun. Stat. Simul. Comput.
Mohamed El Guide, Khalide Jbilou, Christos Koukouvinos, Angeliki Lappa
2023 — conf
Regression Analysis in Machine Learning using conditioned Latin Hypercube Sampling.
DESSERT
Ioannis Iordanis, Christos Koukouvinos, Iliana Silou
2023 — conf
Variable selection in modelling with supersaturated designs: A comparative study.
DESSERT
Christos Koukouvinos, Angeliki Lappa, Marilena Mitrouli
2023 J jnl
Variable selection in saturated and supersaturated designs via lp-lq minimization.
Commun. Stat. Simul. Comput.
Alessandro Buccini, Omar De la Cruz Cabrera, Christos Koukouvinos, Marilena Mitrouli, Lothar Reichel
2022 J jnl
A double moving average control chart: Discussion.
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2022 J jnl
A multivariate triple exponentially weighted moving average control chart.
Qual. Reliab. Eng. Int.
Jean-Claude Malela-Majika, Kashinath Chatterjee, Christos Koukouvinos
2022 J jnl
A new double exponentially weighted moving average control chart for monitoring both location and dispersion.
Qual. Reliab. Eng. Int.
Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2022 J jnl
A progressive mean control chart for COM-Poisson distribution.
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Christos Koukouvinos
2022 — conf
Classification accuracy improvement using conditioned Latin Hypercube Sampling in Supervised Machine Learning.
DESSERT
Ioannis Iordanis, Christos Koukouvinos, Iliana Silou
2022 J jnl
Comparative study of
Commun. Stat. Simul. Comput.
Mohamed El Guide, Khalide Jbilou, Christos Koukouvinos, Angeliki Lappa
2022 J jnl
Evaluation of process capability in gamma regression profiles.
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Christos Koukouvinos
2022 J jnl
Monitoring univariate and multivariate profiles using the triple exponentially weighted moving average scheme with fixed and random explanatory variables.
Comput. Ind. Eng.
Jean-Claude Malela-Majika, Sandile Charles Shongwe, Kashinath Chatterjee, Christos Koukouvinos
2022 J jnl
Numerical methods for estimating the tuning parameter in penalized least squares problems.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Angeliki Lappa, Marilena Mitrouli, Paraskevi Roupa, Ondrej Turek
2022 J jnl
The application of regularisation to variable selection in statistical modelling.
J. Comput. Appl. Math.
Joab R. Winkler, Marilena Mitrouli, Christos Koukouvinos
2022 J jnl
The triple exponentially weighted moving average control chart for monitoring Poisson processes.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2022 J jnl
Univariate and Multivariate Linear Profiles Using Max-Type Extended Exponentially Weighted Moving Average Schemes.
IEEE Access
Jean-Claude Malela-Majika, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
A multidimensional principal component analysis via the c-product Golub-Kahan-SVD for classification and face recognition.
CoRR
Mustapha Hached, Khalide Jbilou, Christos Koukouvinos, Marilena Mitrouli
2021 J jnl
A new S 2 -TEWMA control chart for monitoring process dispersion.
Qual. Reliab. Eng. Int.
Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2021 J jnl
A nonparametric triple exponentially weighted moving average sign control chart.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
A sum of squares triple exponentially weighted moving average control chart.
Qual. Reliab. Eng. Int.
Kashinath Chatterjee, Christos Koukouvinos, Angeliki Lappa
2021 J jnl
A triple exponentially weighted moving average control chart for monitoring time between events.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
An extended nonparametric homogeneously weighted moving average sign control chart.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
Monitoring reliability for a gamma distribution with a double progressive mean control chart.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos
2021 J jnl
Nonparametric triple exponentially weighted moving average signed-rank control chart for monitoring shifts in the process location.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
On developing an exponentially weighted moving average chart under progressive setup: An efficient approach to manufacturing processes - Discussion.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
The extended homogeneously weighted moving average control chart.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2021 J jnl
The triple moving average control chart.
J. Comput. Appl. Math.
Vasileios Alevizakos, Kashinath Chatterjee, Christos Koukouvinos
2020 J jnl
A double exponentially weighted moving average chart for time between events.
Commun. Stat. Simul. Comput.
Vasileios Alevizakos, Christos Koukouvinos
2020 J jnl
A double progressive mean control chart for monitoring Poisson observations.
J. Comput. Appl. Math.
Vasileios Alevizakos, Christos Koukouvinos
2020 J jnl
A generally weighted moving average control chart for zero-inflated Poisson processes.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos
2020 J jnl
A nonparametric double generally weighted moving average signed-rank control chart for monitoring process location.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos, Kashinath Chatterjee
2020 J jnl
A progressive mean control chart for monitoring time between events.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos
2020 J jnl
Efficient estimates in regression models with highly correlated covariates.
J. Comput. Appl. Math.
Christos Koukouvinos, Marilena Mitrouli, Ondrej Turek
2020 J jnl
Monitoring of zero-inflated Poisson processes with EWMA and DEWMA control charts.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos
2019 J jnl
A double exponentially weighted moving average control chart for monitoring COM-Poisson attributes.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos
2019 J jnl
A moving average control chart using a robust scale estimator for process dispersion.
Qual. Reliab. Eng. Int.
Christos Koukouvinos, Angeliki Lappa
2019 J jnl
Monitoring of time between events with a double generally weighted moving average control chart.
Qual. Reliab. Eng. Int.
Vasileios Alevizakos, Christos Koukouvinos, Angeliki Lappa
2019 J jnl
Sure independence screening for analyzing supersaturated designs.
Commun. Stat. Simul. Comput.
Krystallenia Drosou, Christos Koukouvinos
2018 J jnl
A method for analyzing supersaturated designs inspired by control charts.
Commun. Stat. Simul. Comput.
Krystallenia Drosou, Christos Koukouvinos, Angeliki Lappa
2017 J jnl
On the analysis of unbalanced two-level supersaturated designs via generalized linear models.
Commun. Stat. Simul. Comput.
Kashinath Chatterjee, Christos Koukouvinos, Christina Parpoula
2017 J jnl
Screening Active Effects in Supersaturated Designs with Binary Response via Control Charts.
Qual. Reliab. Eng. Int.
Krystallenia Drosou, Christos Koukouvinos, Angeliki Lappa
2017 J jnl
Stochastic estimates for the trace of functions of matrices via Hadamard matrices.
Commun. Stat. Simul. Comput.
Paraskevi Fika, Christos Koukouvinos
2016 J jnl
A New Method for the Analysis of Supersaturated Designs with Discrete Data.
Commun. Stat. Simul. Comput.
Emmanouil Androulakis, Christos Koukouvinos, Filia Vonta
2016 J jnl
Tuning Parameter Selection in Penalized Frailty Models.
Commun. Stat. Simul. Comput.
Emmanouil Androulakis, Christos Koukouvinos, Filia Vonta
2015 J jnl
A Penalized Wrapper Method for Screening Main Effects and Interactions in Supersaturated Designs.
Qual. Reliab. Eng. Int.
Christos Koukouvinos, Christina Parpoula
2014 J jnl
Model Discrimination Criteria on Model-Robust Designs.
Commun. Stat. Simul. Comput.
Emmanouil Androulakis, P. Angelopoulos, Christos Koukouvinos
2013 J jnl
A Comparison of Three-Level Orthogonal Arrays in the Presence of Different Correlation Structures in Observations.
Commun. Stat. Simul. Comput.
Emmanouil Androulakis, P. Angelopoulos, Christos Koukouvinos
2013 J jnl
A General Construction Method for Five-Level Second-Order Rotatable Designs.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Kalliopi Mylona, A. Skountzou, Peter Goos
2013 J jnl
A combination of variable selection and data mining techniques for high-dimensional statistical modelling.
Int. J. Inf. Decis. Sci.
Christos Koukouvinos, Kalliopi Mylona, Christina Parpoula
2013 J jnl
Clustering Effects in Unreplicated Factorial Experiments.
Commun. Stat. Simul. Comput.
P. Angelopoulos, Christos Koukouvinos, A. Skountzou
2013 J jnl
Construction of New Three-Level Response Surface Designs.
Commun. Stat. Simul. Comput.
P. Angelopoulos, Christos Koukouvinos, A. Skountzou
2013 B conf
Genetic Algorithm and Data Mining Techniques for Design Selection in Databases.
ARES
Christos Koukouvinos, Christina Parpoula, Dimitris E. Simos
2012 J jnl
A Discrete Fourier Transform Approach Searching for Compatible Sequences and Optimal Designs.
Informatica (Slovenia)
Stelios D. Georgiou, Krystallenia Drosou, Christos Koukouvinos
2012 J jnl
Analyzing Supersaturated Designs by Means of an Information Based Criterion.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Christina Parpoula
2012 J jnl
Competent genetic algorithms for weighing matrices.
J. Comb. Optim.
Ilias S. Kotsireas, Christos Koukouvinos, Panos M. Pardalos, Dimitris E. Simos
2012 J jnl
New weighing matrices constructed from two circulant submatrices.
Optim. Lett.
Ilias S. Kotsireas, Christos Koukouvinos, Jennifer Seberry
2011 J jnl
A Variable Selection Method for Analyzing Supersaturated Designs.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Kalliopi Mylona, A. Skountzou
2011 J jnl
A modified power spectral density test applied to weighing matrices with small weight.
J. Comb. Optim.
Ilias S. Kotsireas, Christos Koukouvinos, Panos M. Pardalos
2011 J jnl
An algebraic framework for extending orthogonal designs.
ACM Commun. Comput. Algebra
Christos Koukouvinos, Dimitris E. Simos, Zafeirakis Zafeirakopoulos
2011 B conf
Combinatorial Optimization for Weighing Matrices with the Ordering Messy Genetic Algorithm.
SEA
Christos Koukouvinos, Dimitris E. Simos
2011 J jnl
Further results on ternary complementary sequences, orthogonal designs and weighing matrices.
Australas. J Comb.
Christos Koukouvinos, Dimitris E. Simos
2011 — conf
Hadamard Matrices, Designs and Their Secret-Sharing Schemes.
CAI
Christos Koukouvinos, Dimitris E. Simos, Zlatko Varbanov
2011 J jnl
On the average complexity for the verification of compatible sequences.
Inf. Process. Lett.
Christos Koukouvinos, Veronika Pillwein, Dimitris E. Simos, Zafeirakis Zafeirakopoulos
2011 J jnl
Quasi-Cyclic Codes from Cyclic-Structured Designs with Good Properties.
Discret. Math. Algorithms Appl.
Christos Koukouvinos, Dimitris E. Simos
2011 J jnl
Tuning Parameter Estimation in Penalized Least Squares Methodology.
Commun. Stat. Simul. Comput.
Emmanouil Androulakis, Christos Koukouvinos, Kalliopi Mylona
2010 J jnl
An efficient string sorting algorithm for weighing matrices of small weight.
Optim. Lett.
Ilias S. Kotsireas, Christos Koukouvinos, Panos M. Pardalos
2010 J jnl
Analyzing unreplicated 2
Qual. Reliab. Eng. Int.
P. Angelopoulos, Haralambos Evangelaras, Christos Koukouvinos
2010 J jnl
New classes of orthogonal designs and weighing matrices derived from near normal sequences.
Australas. J Comb.
Christos Koukouvinos, Dimitris E. Simos
2010 J jnl
New classes of orthogonal designs constructed from complementary sequences with given spread.
Australas. J Comb.
Ilias S. Kotsireas, Christos Koukouvinos, Jennifer Seberry, Dimitris E. Simos
2010 J jnl
On circulant and two-circulant weighing matrices.
Australas. J Comb.
K. T. Arasu, Ilias S. Kotsireas, Christos Koukouvinos, Jennifer Seberry
2010 J jnl
Periodic complementary binary sequences and Combinatorial Optimization algorithms.
J. Comb. Optim.
Ilias S. Kotsireas, Christos Koukouvinos, Panos M. Pardalos, Oleg V. Shylo
2009 J jnl
An Algorithmic Construction of Four-Level Response Surface Designs.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Kalliopi Mylona, Dimitris E. Simos, A. Skountzou
2009 J jnl
Construction of new self-dual codes over GF(5) using skew-Hadamard matrices.
Adv. Math. Commun.
Christos Koukouvinos, Dimitris E. Simos
2009 J jnl
Hadamard matrices of Williamson type: A challenge for Computer Algebra.
J. Symb. Comput.
Ilias S. Kotsireas, Christos Koukouvinos
2009 J jnl
MDS and near-MDS self-dual codes over large prime fields.
Adv. Math. Commun.
Ilias S. Kotsireas, Christos Koukouvinos, Dimitris E. Simos
2009 — conf
Self-dual Codes over Small Prime Fields from Combinatorial Designs.
CAI
Christos Koukouvinos, Dimitris E. Simos
2008 J jnl
A Method for Analyzing Supersaturated Designs with a Block Orthogonal Structure.
Commun. Stat. Simul. Comput.
Christos Koukouvinos, Kalliopi Mylona
2008 J jnl
Heuristic algorithms for Hadamard matrices with two circulant cores.
Theor. Comput. Sci.
Marco Chiarandini, Ilias S. Kotsireas, Christos Koukouvinos, Luís Paquete
2008 J jnl
New orthogonal designs from weighing matrices.
Australas. J Comb.
Ilias S. Kotsireas, Christos Koukouvinos, Jennifer Seberry
2008 J jnl
New skew-Hadamard matrices via computational algebra.
Australas. J Comb.
Ilias S. Kotsireas, Christos Koukouvinos
2008 J jnl
On skew-Hadamard matrices.
Discret. Math.
Christos Koukouvinos, Stella Stylianou
2007 J jnl
An update on primitive ternary complementary pairs.
J. Comb. Theory A
Robert Craigen, Will Gibson, Christos Koukouvinos
2007 J jnl
Exploring k.
Comput. Stat. Data Anal.
Christos Koukouvinos, Kalliopi Mylona, Dimitris E. Simos
2007 — conf
Inequivalent Hadamard matrices from orthogonal designs.
PASCO
Ilias S. Kotsireas, Christos Koukouvinos
2007 J jnl
Orthogonal designs of order 32 and 64 via computational algebra.
Australas. J Comb.
Ilias S. Kotsireas, Christos Koukouvinos
2006 J jnl
A comparison between the Gröbner bases approach and hidden projection properties in factorial designs.
Comput. Stat. Data Anal.
Haralambos Evangelaras, Christos Koukouvinos
2006 J jnl
Further explorations into ternary complementary pairs.
J. Comb. Theory A
Robert Craigen, Stelios Georgiou, Will Gibson, Christos Koukouvinos
2006 J jnl
Genetic algorithms for orthogonal designs.
Australas. J Comb.
Jason Cousineau, Ilias S. Kotsireas, Christos Koukouvinos
2006 J jnl
Hadamard ideals and Hadamard matrices with two circulant cores.
Eur. J. Comb.
Ilias S. Kotsireas, Christos Koukouvinos, Jennifer Seberry
2005 B conf
Construction of Two Level Orthogonal Arrays Via Solutions of Linear Systems.
CASC
Christos Koukouvinos, E. Lappas
2004 J jnl
Construction of new skew Hadamard matrices and their use in screening experiments.
Comput. Stat. Data Anal.
Stelios Georgiou, Christos Koukouvinos, Stella Stylianou
2004 J jnl
Generalized orthogonal designs.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos, Jennifer Seberry
2004 J jnl
New skew-Hadamard matrices of order 4cdot59 and new D-optimal designs of order 2cdot59.
Discret. Math.
Roderick J. Fletcher, Christos Koukouvinos, Jennifer Seberry
2004 J jnl
On inequivalent Hadamard matrices of order 36.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos
2004 J jnl
On inequivalent Hadamard matrices of order 44.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos
2004 J jnl
On the computation of maximum minors of Hadamard matrices.
Math. Comput. Simul.
Christos Koukouvinos, E. Lappas, Marilena Mitrouli
2004 J jnl
Orthogonal Designs of Kharaghani Type: II.
Ars Comb.
Christos Koukouvinos, Jennifer Seberry
2004 J jnl
Self-Orthogonal and Self-Dual Codes Constructed via Combinatorial Designs and Diophantine Equations.
Des. Codes Cryptogr.
Stelios Georgiou, Christos Koukouvinos
2003 J jnl
On equivalence of Hadamard matrices and projection properties.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos
2003 J jnl
On self-dual codes over some prime fields.
Discret. Math.
Koichi Betsumiya, Stelios Georgiou, T. Aaron Gulliver, Masaaki Harada, Christos Koukouvinos
2003 J jnl
Orthogonal Designs of Kharaghani Type: I.
Ars Comb.
Christos Koukouvinos, Jennifer Seberry
2003 J jnl
Some results on self-orthogonal and self-dual codes.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos, Jennifer Seberry
2003 J jnl
Values of Minors of an Infinite Family of
SIAM J. Matrix Anal. Appl.
Christos Koukouvinos, Marilena Mitrouli, Jennifer Seberry
2002 J jnl
On Full Orthogonal Designs in Order 56.
Ars Comb.
Stelios Georgiou, Christos Koukouvinos, Jennifer Seberry
2002 J jnl
On good matrices, skew Hadamard matrices and optimal designs.
Comput. Stat. Data Anal.
Stelios Georgiou, Christos Koukouvinos, Stella Stylianou
2002 J jnl
Orthogonal Designs and Type II Codes over Z2k.
Des. Codes Cryptogr.
Stelios Georgiou, Masaaki Harada, Christos Koukouvinos
2001 J jnl
A Theory of Ternary Complementary Pairs.
J. Comb. Theory A
Robert Craigen, Christos Koukouvinos
2001 J jnl
On Sequences with Zero Autocorrelation and Orthogonal Designs.
J. Comb. Theory A
Stelios Georgiou, Christos Koukouvinos
2001 J jnl
On the Complete Pivoting Conjecture for Hadamard Matrices of Small Orders.
J. Res. Pract. Inf. Technol.
Christos Koukouvinos, E. Lappas, Marilena Mitrouli, Jennifer Seberry
2001 J jnl
Values of Minors of (1, -1) Incidence Matrices of SBIBDs and Their Application to the Growth Problem.
Des. Codes Cryptogr.
Christos Koukouvinos, Marilena Mitrouli, Jennifer Seberry
2001 J jnl
Values of Minors of an Infinite Family of
SIAM J. Matrix Anal. Appl.
Christos Koukouvinos, Marilena Mitrouli, Jennifer Seberry
1999 C conf
New Self-Dual Codes over GF(5).
IMACC
Stelios Georgiou, Christos Koukouvinos
1999 J jnl
New orthogonal designs and sequences with two and three variables in order 28.
Ars Comb.
Christos Koukouvinos, Jennifer Seberry
1997 J jnl
On the computation of the Smith normal form of compound matrices.
Numer. Algorithms
Marilena Mitrouli, Christos Koukouvinos
1996 J jnl
On sufficient conditions for some orthogonal designs and sequences with zero autocorrelation function.
Australas. J Comb.
Christos Koukouvinos, Marilena Mitrouli, Jennifer Seberry, P. Karabelas
1996 — conf
On the Growth Problem for D-Optimal Designs.
WNAA
Marilena Mitrouli, Christos Koukouvinos
1996 J jnl
Relative Difference Sets.
J. Comb. Theory A
Christos Koukouvinos, Albert Leon Whiteman
1994 J jnl
Multiplication of sequences with zero autocorrelation.
Australas. J Comb.
Christos Koukouvinos, Stratis Kounias, Jennifer Seberry, C. H. Yang, Joel Yang
1994 J jnl
On Sequences with Zero Autocorrelation.
Des. Codes Cryptogr.
Christos Koukouvinos, Stratis Kounias, Jennifer Seberry, C. H. Yang, Y. Yang
1994 J jnl
The Non-equivalent Circulant D-Optimal Designs for n=2 mod 4, n<=54, n=66.
J. Comb. Theory A
Stratis Kounias, Christos Koukouvinos, Nikolaos P. Nikolaou, A. S. Kakos
1993 J jnl
Some new weighing matrices using sequences with zero autocorrelation function.
Australas. J Comb.
Christos Koukouvinos, Jennifer Seberry
1992 J jnl
Constructing Hadamard matrices from orthogonal designs.
Australas. J Comb.
Christos Koukouvinos, Jennifer Seberry
1991 J jnl
Hadamard matrices of order =8 (mod 16) with maximal excess.
Discret. Math.
Christos Koukouvinos, Jennifer Seberry
1991 J jnl
On Golay sequences.
Discret. Math.
Stratis Kounias, Christos Koukouvinos, K. Sotirakoglou
1991 J jnl
Supplementary difference sets and optimal designs.
Discret. Math.
Christos Koukouvinos, Stratis Kounias, Jennifer Seberry
1990 J jnl
Construction of some Hadamard matrices with maximum excess.
Discret. Math.
Christos Koukouvinos, Stratis Kounias
1988 J jnl
Hadamard matrices of the Williamson type of order 4·m, m=p·q an exhaustive search for m=33.
Discret. Math.
Christos Koukouvinos, Stratis Kounias