1. File organization schemes based on finite geometries;Abraham;Inform. Contr.,1968
2. The application of difference sets to the design of a balanced multiple-valued filing scheme;Berman;Inform. Contr.,1976
3. Group Generated Balanced Combinatorial Configurations and Information Retrieval Systems for Files;Berman,1976
4. File organization of records with multiple valued attributes for multi-attribute queries;Bose,1967
5. The design of combinatorial information retrieval systems for files with multiple valued attributes;Bose;SIAM J. Appl. Math.,1969