Pedro Antunes

137 papers B 3C 18Misc 3Journal 36Unranked 72
YearRankTypeTitle / Venue / Authors
2025 J jnl
Construction of Conceptual Frameworks in Research: An Information Systems Design Perspective.
Commun. Assoc. Inf. Syst.
Pedro Antunes, David Johnstone, Nguyen Hoang Thuan
2024 J jnl
Guiding the implementation of data privacy with microservices.
Int. J. Inf. Sec.
Pedro Antunes, Nuno Guimarães
2023 J jnl
A Scoping Review on Agency Collaboration in Emergency Management Based on the 3C Model.
Inf. Syst. Frontiers
Tenanoia Simona, Tauisi Taupo, Pedro Antunes
2023 J jnl
A hybrid human-AI tool for scientometric analysis.
Artif. Intell. Rev.
António Correia, Andrea Grover, Shoaib Jameel, Daniel Schneider, Pedro Antunes, Benjamim Fonseca
2023 J jnl
The composite approach as a hybrid approach to business process modeling: proposition and empirical evaluation.
Bus. Process. Manag. J.
Pedro Antunes, José A. Pino, Mathews Nkhoma, Nguyen Hoang Thuan
2022 J jnl
Business process conceptualizations and the flexibility-support tradeoff.
Bus. Process. Manag. J.
Pedro Antunes, Mary Tate
2022 J jnl
Examining the canvas as a domain-independent artifact.
Inf. Syst. E Bus. Manag.
Pedro Antunes, Mary Tate
2022 J jnl
Nature and purpose of visual artifacts in design science research.
Inf. Syst. E Bus. Manag.
Pedro Antunes, Nguyen Hoang Thuan, David Johnstone
2022 J jnl
Positioning Design Science as an Educational Tool for Innovation and Problem Solving.
Commun. Assoc. Inf. Syst.
Nguyen Hoang Thuan, Pedro Antunes
2022 J jnl
Using Process Stories to Foster Process Flexibility: The Experts' Viewpoint.
Australas. J. Inf. Syst.
Nguyen Hoang Thuan, Ai-Phuong Hoang, Mathews Nkhoma, Pedro Antunes
2021 J jnl
Nature and Purpose of Conceptual Frameworks in Design Science.
Scand. J. Inf. Syst.
Pedro Antunes, Nguyen Hoang Thuan, David Johnstone
2020 J jnl
Eliciting Process Knowledge Through Process Stories.
Inf. Syst. Frontiers
Pedro Antunes, José A. Pino, Mary Tate, Alistair Barros
2020 — conf
Toward an Ontology for Improving Process Flexibility.
FDSE
Nguyen Hoang Thuan, Ai-Phuong Hoang, Majo George, Mathews Nkhoma, Pedro Antunes
2019 — conf
A Tool for Modelling Business Behaviour Using Decision Tables.
ISCIT
Tomas Antunes, Pedro Antunes, David Johnstone, Vo Trong Nghia, Nguyen Hoang Thuan
2019 — conf
Business Processes and Flexibility: A Theoretical Perspective.
ACIS
Pedro Antunes, Mary Tate, José A. Pino
2019 J jnl
Construction of Design Science Research Questions.
Commun. Assoc. Inf. Syst.
Nguyen Hoang Thuan, Andreas Drechsler, Pedro Antunes
2019 — conf
Design and Development of a DSS Supporting the Integration of Crowdsourcing in Theory Testing: A Design Science Perspective.
PACIS
Ijeoma Enwereuzo, Pedro Antunes, David Johnstone, Gert-Jan de Vreede
2019 — conf
Method Supporting the Adoption of Visual Stories in Judicial Systems.
ECIS
Francisco Barros Leite, Pedro Antunes, Nuno Guimarães, José A. Pino
2019 — conf
Method for Eliciting and Analyzing Business Processes Based on Storytelling Theory.
HICSS
Pedro Antunes, José A. Pino, Mary Tate
2019 — conf
Patterns of Testing Theory with Human Subjects: A Design Science Perspective.
AMCIS
Ijeoma Enwereuzo, Pedro Antunes, David Johnstone
2019 — conf
Towards the Development of a DSS Supporting the Integration of Crowdsourcing in Theory Testing: Analytical Framework Design.
AMCIS
Ijeoma Enwereuzo, Pedro Antunes, David Johnstone
2018 — conf
A Pluralistic Approach to Information Valuation.
PACIS
Julia Dakova, Pedro Antunes, Yi-Te Chiu
2018 J jnl
Eliciting and Modeling Business Process Stories.
Bus. Inf. Syst. Eng.
David Simões, Pedro Antunes, Luís Carriço
2018 — conf
On the adoption of crowdsourcing for theory testing.
ECIS
Ijeoma Enwereuzo, Pedro Antunes, David Johnstone
2018 — conf
Supporting People-Driven, Dynamic and Geo-Located Work Processes.
S-BPM ONE
Pedro Antunes, Nelson Baloian, Gustavo Zurita, José A. Pino
2017 C ed.
21st IEEE International Conference on Computer Supported Cooperative Work in Design, CSCWD 2017, Wellington, New Zealand, April 26-28, 2017
CSCWD
Weiming Shen, Pedro Antunes, Nguyen Hoang Thuan, Jean-Paul A. Barthès, Junzhou Luo, Jianming Yong
2017 J jnl
A Process Model for Establishing Business Process Crowdsourcing.
Australas. J. Inf. Syst.
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2017 J jnl
Gathering big data for teamwork evaluation with microworlds.
Clust. Comput.
Cláudio Sapateiro, Pedro Antunes, David Johnstone, José A. Pino
2017 — conf
Towards the Development of a DSS Supporting the Integration of Crowdsourcing in Theory Testing: Conceptual Framework and Model.
ACIS
Ijeoma Enwereuzo, Pedro Antunes, David Johnstone
2017 C conf
Understanding and modelling organisational information flows.
CSCWD
Nguyen Hoang Thuan, David Swann, Yi-Te Chiu, Pedro Antunes
2016 J jnl
A Design Science Method for Emerging Decision Support Environments.
CoRR
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2016 J jnl
Collaboration technology in teams and organizations: Introduction to the special issue.
Inf. Syst. Frontiers
Gert-Jan de Vreede, Pedro Antunes, Julita Vassileva, Marco Aurélio Gerosa, Kewen Wu
2016 — ch.
Enriching Knowledge in Business Process Modelling: A Storytelling Approach.
Innovations in Knowledge Management
David Simões, Pedro Antunes, Jocelyn Cranefield
2016 J jnl
Factors influencing the decision to crowdsource: A systematic literature review.
Inf. Syst. Frontiers
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2016 C conf
Pilot experiments on a designed crowdsourcing decision tool.
CSCWD
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2016 C conf
Teamwork evaluation with a microworld platform.
CSCWD
Cláudio Sapateiro, Pedro Antunes, Ijeoma Enwereuzo, David Johnstone, José A. Pino
2016 C conf
Towards a unified conceptualisation of IS agility.
CSCWD
Haibo Yang, Pedro Antunes, Mary Tate
2015 — conf
Building an Enterprise Ontology of Business Process Crowdsourcing: A Design Science Approach.
PACIS
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone, Ha Xuan Son
2015 — conf
Establishing a Decision Tool for Business Process Crowdsourcing.
FDSE
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone, Nguyen Huynh Anh Duy
2015 — conf
Estimating Production Time of Touchless Hand Drawing Gestures.
INTERACT (3)
Orlando Erazo, José A. Pino, Pedro Antunes
2015 — conf
Modelling Sensible Business Processes.
FDSE
David Simões, Nguyen Hoang Thuan, Lalitha Jonnavithula, Pedro Antunes
2015 — conf
Organisational Issues in Modelling Business Processes: An Activity-Based Inventory and Directions for Research.
PACIS
Lalitha Jonnavithula, Pedro Antunes, Jocelyn Cranefield, José A. Pino
2014 — conf
An Architecture Utilizing the Crowd for Building an Anti-virus Knowledge Base.
FDSE
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone, Minh Nhat Quang Truong
2014 J jnl
An application framework for developing collaborative handheld decision-making tools.
Behav. Inf. Technol.
Pedro Antunes, Gustavo Zurita, Nelson Baloian
2014 J jnl
Key indicators for assessing the design of geocollaborative applications.
Int. J. Inf. Technol. Decis. Mak.
Pedro Antunes, Gustavo Zurita, Nelson Baloian
2014 — conf
Requirements for Ad-hoc Geo-referenced BPM with Microblogging.
CRIWG
Pedro Antunes, Gustavo Zurita, Nelson Baloian
2014 J jnl
Reviewing the quality of awareness support in collaborative applications.
J. Syst. Softw.
Pedro Antunes, Valeria Herskovic, Sergio F. Ochoa, José A. Pino
2014 — conf
Toward a Nexus Model Supporting the Establishment of Business Process Crowdsourcing.
FDSE
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2013 J jnl
An end-user approach to business process modeling.
J. Netw. Comput. Appl.
Pedro Antunes, David Simões, Luís Carriço, José A. Pino
2013 — ed.
Collaboration and Technology - 19th International Conference, CRIWG 2013, Wellington, New Zealand, October 30 - November 1, 2013, Proceedings
CRIWG
Pedro Antunes, Marco Aurélio Gerosa, Allan Sylvester, Julita Vassileva, Gert-Jan de Vreede
2013 — conf
Factors Influencing the Decision to Crowdsource.
CRIWG
Nguyen Hoang Thuan, Pedro Antunes, David Johnstone
2013 — conf
Identifying the Awareness Mechanisms for Mobile Collaborative Applications.
CRIWG
Valeria Herskovic, Sergio F. Ochoa, José A. Pino, Pedro Antunes, Emilio G. Ormeño
2013 C conf
Modeling highly collaborative processes.
CSCWD
Pedro Antunes, Valeria Herskovic, Sergio F. Ochoa, José A. Pino
2012 J jnl
Collaboration and Conflict in Software Review Meetings.
Int. J. Inf. Technol. Decis. Mak.
Giovana Brandao Ribeiro Linhares, Marcos R. S. Borges, Pedro Antunes
2012 C conf
Humanistic approach to the representation of business processes.
CSCWD
David Simões, Pedro Antunes, José A. Pino
2012 B conf
Some observations from the analysis of an online discussion board.
SMC
Sergio F. Ochoa, José A. Pino, Nelson Baloian, Pedro Antunes, Valeria Herskovic
2012 J jnl
Structuring dimensions for collaborative systems evaluation.
ACM Comput. Surv.
Pedro Antunes, Valeria Herskovic, Sergio F. Ochoa, José A. Pino
2012 C conf
Understanding presence awareness information needs among engineering students.
CSCWD
Valeria Herskovic, H. Andrés Neyem, Sergio F. Ochoa, José A. Pino, Pedro Antunes
2011 C conf
Analyzing the support for large group collaborations using Google Maps.
CSCWD
Pedro Antunes, Antonio Ferreira, Gustavo Zurita, Nelson Baloian
2011 J jnl
BPM and Exception Handling: Focus on Organizational Resilience.
IEEE Trans. Syst. Man Cybern. Part C
Pedro Antunes
2011 — conf
Developing Collaboration Awareness Support from a Cognitive Perspective.
HICSS
Pedro Antunes, Antonio Ferreira
2011 J jnl
Developing a Mobile Collaborative Tool for Business Continuity Management.
J. Univers. Comput. Sci.
Cláudio Sapateiro, Nelson Baloian, Pedro Antunes, Gustavo Zurita
2011 C conf
Evaluating the Use of Mobile Devices in Critical Incidents Response: A Microworld Approach.
WETICE
Cláudio Sapateiro, Antonio Ferreira, Pedro Antunes
2011 J jnl
Resilient Business Process Management: Framework and services.
Expert Syst. Appl.
Pedro Antunes, Hernâni Mourão
2011 C conf
Supporting experimental collaborative systems evaluation.
CSCWD
Cláudio Sapateiro, Pedro Antunes, José A. Pino
2010 — conf
A Review of CRIWG Research.
CRIWG
Pedro Antunes, José A. Pino
2010 — conf
Awareness Checklist: Reviewing the Quality of Awareness Support in Collaborative Applications.
CRIWG
Pedro Antunes, Cláudio Sapateiro, José A. Pino, Valeria Herskovic, Sergio F. Ochoa
2010 — ch.
Development of a Mobile Situation Awareness Tool Supporting Disaster Recovery of Business Operations.
Supporting Real Time Decision-Making
Pedro Antunes, Cláudio Sapateiro, Gustavo Zurita, Nelson Baloian
2010 — conf
Integrating Spatial Data and Decision Models in an E-Planning Tool.
CRIWG
Pedro Antunes, Cláudio Sapateiro, Gustavo Zurita, Nelson Baloian
2009 — conf
A Model for Designing Geocollaborative Artifacts and Applications.
CRIWG
Pedro Antunes, Gustavo Zurita, Nelson Baloian
2009 C conf
Adding a resilience-enhanced component to the WfMC reference architecture.
CSCWD
Pedro Antunes, Hernâni Mourão
2009 J jnl
Collaborative Technology and Environments.
J. Univers. Comput. Sci.
Pedro Antunes, Robert O. Briggs
2009 C conf
Developing collaborative peer-to-peer applications on mobile devices.
CSCWD
Cláudio Sapateiro, Nelson Baloian, Pedro Antunes, Gustavo Zurita
2009 J jnl
Evaluating shared workspace performance using human information processing models.
Inf. Res.
Antonio Ferreira, Pedro Antunes, José A. Pino
2009 — conf
Negotiation-Collaboration in Formal Technical Reviews.
CRIWG
Giovana Brandao Ribeiro Linhares, Marcos R. S. Borges, Pedro Antunes
2009 C conf
Tackling collaborative-design of mobile prototypes.
CSCWD
Luís Carriço, Luís Duarte, Marco de Sá, Rogério Bandeira, Pedro Antunes
2009 — ch.
Using WfMS to Support Unstructured Activities.
Handbook of Research on Business Process Modeling
Hernâni Mourão, Pedro Antunes
2008 — conf
An Attentive Groupware Device to Mitigate Information Overload.
DSV-IS
Antonio Ferreira, Pedro Antunes
2008 — conf
Attention-Based Management of Information Flows in Synchronous Electronic Brainstorming.
CRIWG
Antonio Ferreira, Valeria Herskovic, Pedro Antunes
2008 — conf
Evaluating a Mobile Emergency Response System.
CRIWG
Cláudio Sapateiro, Pedro Antunes, Gustavo Zurita, Rodrigo Vogt, Nelson Baloian
2008 — ed.
Groupware: Design, Implementation, and Use, 14th International Workshop, CRIWG 2008, Omaha, NE, USA, September 14-18, 2008, Revised Selected Papers
CRIWG
Robert O. Briggs, Pedro Antunes, Gert-Jan de Vreede, Aaron Read
2008 — conf
Risk Assessment in Healthcare Collaborative Settings: A Case Study Using SHELL.
CRIWG
Pedro Antunes, Rogério Bandeira, Luís Carriço, Gustavo Zurita, Nelson Baloian, Rodrigo Vogt
2008 — conf
Supporting Crisis Management Processes by Wirelessly Interconnected Tablet-PCs.
ICEBE
Cláudio Sapateiro, Pedro Antunes, Gustavo Zurita, Nelson Baloian, Rodrigo Vogt
2008 — conf
Supporting Unstructured Activities in Crisis Management: A Collaboration Model and Prototype to Improve Situation Awareness.
Mobile Response
Cláudio Sapateiro, Pedro Antunes, Gustavo Zurita, Nelson Baloian, Rodrigo Vogt
2008 — conf
Supporting Unstructured Work Activities in Emergent Work Processes.
ICEIS (5)
Cláudio Sapateiro, Pedro Antunes
2008 J jnl
Using PDAs in Meetings: Patterns, Architecture and Components.
J. Univers. Comput. Sci.
Gustavo Zurita, Pedro Antunes, Nelson Baloian, Luís Carriço, Felipe Baytelman, Marco de Sá
2008 — conf
Visually-Driven Decision Making Using Handheld Devices.
CDM
Gustavo Zurita, Pedro Antunes, Nelson Baloian, Felipe Baytelman, Antonio Farias
2007 C conf
A Flexible, Lightweight Middleware Supporting the Development of Distributed Applications across Platforms.
CSCWD
Nelson Baloian, Gustavo Zurita, Pedro Antunes, Felipe Baytelman
2007 C conf
A Framework like a tool for specify motivating Collaborative Learning Participatory Simulations.
CSCWD
Gustavo Zurita, Nelson Baloian, Felipe Baytelman, Antonio Farias, Pedro Antunes
2007 — conf
A Platform Supporting the Implementation of Collaborative Learning through Participatory Simulations.
CSCWD (Selected Papers)
Gustavo Zurita, Nelson Baloian, Felipe Baytelman, Antonio Farias, Pedro Antunes
2007 — conf
Alternative Dispute Resolution Based on the Storytelling Technique.
CRIWG
Pedro Antunes, Sara Relvas, Marcos R. S. Borges
2007 — conf
Applying Sensemaking in a Mobile Learning Scenario.
EC-TEL (Posters)
Gustavo Zurita, Nelson Baloian, Pedro Antunes, Felipe Baytelman
2007 Misc conf
Defining personalized therapies for handheld devices.
SAC
Marco de Sá, Luís Carriço, Pedro Antunes
2007 — conf
Evaluation Methods for Groupware Systems.
CRIWG
Valeria Herskovic, José A. Pino, Sergio F. Ochoa, Pedro Antunes
2007 J jnl
Government Funding of E-collaboration Research in the European Union: A Comparison with the United States Model.
Int. J. e Collab.
Ned Kock, Pedro Antunes
2007 — conf
Mobile Sensemaking: Exploring Proximity and Mobile Applications in the Classroom.
EC-TEL (Posters)
Pedro Antunes, Nelson Baloian, Gustavo Zurita, Felipe Baytelman
2007 J jnl
Mobile Sensemaking: Exploring Proximity and Mobile Applications in the Classroom.
J. Univers. Comput. Sci.
Gustavo Zurita, Pedro Antunes, Nelson Baloian, Felipe Baytelman
2007 — conf
Reflections on Teaching Human-Computer Interaction to Blind Students.
HCIEd
Teresa Chambel, Pedro Antunes, Carlos Duarte, Luís Carriço, Nuno Guimarães
2007 Misc conf
Supporting effective unexpected exceptions handling in workflow management systems.
SAC
Hernâni Mourão, Pedro Antunes
2007 J jnl
Ubiquitous Psychotherapy.
IEEE Pervasive Comput.
Marco de Sá, Luís Carriço, Pedro Antunes
2006 — conf
A Technique for Evaluating Shared Workspaces Efficiency.
CSCWD (Selected Papers)
Antonio Ferreira, Pedro Antunes
2006 J jnl
Addressing the Conflicting Dimension of Groupware: A Case Study in Software Requirements Validation.
Comput. Artif. Intell.
Pedro Antunes, João Ramires, Ana Respício
2006 — conf
Analyzing Shared Workspaces Design with Human-Performance Models.
CRIWG
Pedro Antunes, Antonio Ferreira, José A. Pino
2006 — conf
Analyzing the Roles of PDA in Meeting Scenarios.
CRIWG
Gustavo Zurita, Pedro Antunes, Luís Carriço, Felipe Baytelman, Marco de Sá, Nelson Baloian
2006 — conf
Handheld Tools for Personalized and Proactive Psychotherapy.
ICEIS (Selected Papers)
Luís Carriço, Marco de Sá, Pedro Antunes
2006 — conf
Proactive Psychotherapy with Handheld Devices.
ICEIS (5)
Luís Carriço, Marco de Sá, Pedro Antunes
2006 C conf
Quantitative Evaluation of Workspace Collaboration.
CSCWD
Antonio Ferreira, Pedro Antunes
2006 J jnl
The use of genre analysis in the design of electronic meeting systems.
Inf. Res.
Pedro Antunes, Carlos J. Costa, José A. Pino
2005 — conf
A Collaborative Framework for Unexpected Exception Handling.
CRIWG
Hernâni Mourão, Pedro Antunes
2005 — conf
Analytic Evaluation of Groupware Design.
CSCWD (Selected papers)
Pedro Antunes, Marcos R. S. Borges, José A. Pino, Luís Carriço
2005 — conf
Analyzing groupware design by means of usability results.
CSCWD (1)
Pedro Antunes, Marcos R. S. Borges, José A. Pino, Luís Carriço
2005 — conf
Software Requirements Negotiation Using the Software Quality Function Deployment.
CRIWG
João Ramires, Pedro Antunes, Ana Respício
2004 — conf
Exception Handling Through a Workflow.
CoopIS/DOA/ODBASE (1)
Hernâni Mourão, Pedro Antunes
2004 — conf
SaGISC: A Geo-Collaborative System.
CRIWG
Paula André, Pedro Antunes
2003 B conf
From genre analysis to the design of meetingware.
GROUP
Pedro Antunes, Carlos J. Costa
2003 — conf
Making XML From Hypemedia Models.
ICWI
Luís Carriço, Rui Lopes, Miguel Rodrigues Fornari, Amadeu Dias, Pedro Antunes
2003 — conf
Perceived Value: A Low-Cost Approach to Evaluate Meetingware.
CRIWG
Pedro Antunes, Carlos J. Costa
2003 — conf
Workflow Recovery Framework for Exception Handling: Involving the User.
CRIWG
Hernâni Mourão, Pedro Antunes
2002 — conf
Evaluating EMS Value - The Case of a Small Accountancy Firm.
ICEIS
Carlos J. Costa, Pedro Antunes
2002 — conf
Handheld CSCW in the Meeting Environment.
CRIWG
Pedro Antunes, Carlos J. Costa
2002 C conf
Integrating Two Organizational Systems through Communication Genres.
COORDINATION
Carlos J. Costa, Pedro Antunes, João Ferreira Dias
2001 — conf
Applying Genre Analysis to EMS Design: The Example of a Small Accounting Firm.
CRIWG
Pedro Antunes, Carlos J. Costa, João Ferreira Dias
2001 — conf
The Meeting Report Process: Bridging EMS with PDA.
ICEIS (2)
Carlos J. Costa, Pedro Antunes, Ferreira Dias
2000 — conf
An Information Systems Approach to Support Decision Makers Selecting Group Decision Processes.
CRIWG
Nuno Pina Gonçalves, Pedro Antunes
2000 — conf
Integrating Meeting Results in Organisations.
ICEIS
Carlos J. Costa, Pedro Antunes, Ferreira Dias
1999 — conf
Developing a Tool to Assist Electronic Facilitation of Decision-Making Groups.
SPIRE/CRIWG
Tania Ho, Pedro Antunes
1999 — conf
Facilitating Organisational Activities Using Plans and Audits.
ICEIS
Carlos J. Costa, Tania Ho, Pedro Antunes
1999 — conf
Visual Reflection: Language, Action and Feedback.
VL
Luís Carriço, Pedro Antunes, Nuno Guimarães
1998 B conf
A system for supporting and managing same-time/different-place group interactions.
AVI
Pedro Antunes
1998 — conf
On the design of Group Decision Processes for Electronic Meeting Rooms.
CRIWG
Pedro Antunes, Carlos J. Costa, Margarida Duque, Nuno Guimarães, Tania Ho, Jorge Jesuino, Horst Stadler
1997 — conf
Transforming Formal and Informal Work Processes.
CRIWG
Pedro Antunes, Nuno Guimarães
1996 Misc conf
Enhancing Dependability of Cooperative Applications in Partitionable Environments.
EDCC
François J. N. Cosquer, Pedro Antunes, Paulo Veríssimo
1996 — conf
User-Interface Support to Group Interaction.
CRIWG
Pedro Antunes, Nuno Guimarães
1995 — conf
Beyond formal processes: augmenting workflow with group interaction techniques.
COOCS
Pedro Antunes, Nuno Guimarães, Javier Segovia, Jesús Cardeñosa Lera
1995 — conf
NGTool-Exploring Mechanisms of Support to Interactivity in the Group Process.
CRIWG
Pedro Antunes, Nuno Guimarães
1992 — conf
Support for Open Tools and Systems.
TOOLS (7)
Luís Carriço, Pedro Antunes, Nuno Guimarães, Paula Pereira, Maria Moreno
1991 — conf
INGRID - an Object-Oriented Interface Builder.
TOOLS (5)
Luís Carriço, Nuno Guimarães, Pedro Antunes