Fazli Can, Esen A. Ozkarahan Concepts and Effectiveness of the Cover-Coefficient-Based Clustering Methodology for Text Databases. [Citation Graph (0, 10)][DBLP] ACM Trans. Database Syst., 1990, v:15, n:4, pp:483-517 [Journal]
Ryohei Nakano Translation with Optimization from Relational Calculus to Relational Algebra Having Aggregate Functions. [Citation Graph (6, 18)][DBLP] ACM Trans. Database Syst., 1990, v:15, n:4, pp:518-557 [Journal]
H. V. Jagadish A Compression Technique to Materialize Transitive Closure. [Citation Graph (10, 26)][DBLP] ACM Trans. Database Syst., 1990, v:15, n:4, pp:558-598 [Journal]