| 1981 | A Comparison of Search Term Weighting: Term Relevance vs. Inverse Document Frequency. Harry Wu, Gerard Salton |
| 1981 | An Approach to Probabilistic Retrieval. Clement T. Yu, K. Lam |
| 1981 | Content Analysis as a Word-Processing Option. John M. Carroll |
| 1981 | Document Classification, Indexing and Abstracting May be Inherently Difficult Problems. Aviezri S. Fraenkel |
| 1981 | Document Contents Representation Model of Sentence Retrieval System SCAT-IR. Michiyo Nikkuni, Hajime Tanaka |
| 1981 | Dynamic Clustering Procedures for Bibliographic Data. Yahiko Kambayashi, Takaki Hayashi, Shuzo Yajima |
| 1981 | Experiments on the Application of Clustering Techniques to Data Validation (Abstract). William F. Storer, Caroline M. Eastman |
| 1981 | Expert/Consultation System for a Retrieval Data-Base with Semantic Network of Concepts. Peretz Shoval |
| 1981 | Incorporating Different Search Models into One Document Retrieval System. W. Bruce Croft |
| 1981 | On the Limitations of Document Ranking Algorithms in Information Retrieval. Keith H. Stirling |
| 1981 | Outline of a Dynamic Self-Tuning and Adaptive Information Retrieval System. Hans-Ludwig Hausen |
| 1981 | Performance Measurement in a Fuzzy Retrieval Environment. Duncan A. Buell, Donald H. Kraft |
| 1981 | Representation Issues in Information Retrieval System Design. Linda C. Smith |
| 1981 | Restricted Evaluation in Information Retrieval. Peter Bollmann, Vladimir S. Cherniavsky |
| 1981 | Simulation of User Judgments in Bibliographic Retrieval Systems. Jean Tague, Michael J. Nelson |
| 1981 | Spatial Representations of Knowledge: Validity and Applications to Information Science. Terry Noreault, John F. Dovidio |
| 1981 | Statistical Models for Unformatted Text. Christopher Landauer |
| 1981 | Term Frequency and Term Value. Stephen E. Robertson |
| 1981 | The Basis for a Theory of Information Retrieval. Jason Farradane |
| 1981 | The Generalized Retrieval Problem. Abraham Bookstein |
| 1981 | The Nearest Neighbour Problem in Information Retrieval: An Algorithm Using Upperbounds. Alan F. Smeaton, C. J. van Rijsbergen |
| 1981 | Theoretical Issues in Information Retrieval, Proceedings of the Fourth International Conference on Information Storage and Retrieval, Oakland, California, USA, May 31 - June 2, 1981 Carolyn J. Crouch |
| 1981 | Title, Preface, Table of Contents, Author Index. |