Quantified statements in a flexible relational query language. Soft Querying, a New Feature for Database Management Systems. Fuzzy Relations, Ill-Known Values and the Relational Division. Fuzzy queries and relational databases. On the Interpretation of Set-Oriented Fuzzy Quantified Queries and Their Evaluation in a Database Management System.
Indexing principles for a fuzzy data base.
A Framework Based on Fuzzy Sets. Based on a Simple Natural Language. On the Use of a Database Machine for Fuzzy Querying. An Interface to Interrogate Heterogeneous Distributed Databases.