Extending relational algebra to handle bipolarity

Fuzzy sets

L. A. Zadeh · Information and Control · 1965 · 66.1K citations

Intuitionistic fuzzy sets

Krassimir Atanassov · Fuzzy Sets and Systems · 1986 · 16.2K citations · Full text

Preference formulas in relational queries

Jan Chomicki · ACM Transactions on Database Systems · 2003 · 457 citations

Computing, Computer Science, Information Systems +17

Twofold fuzzy sets and rough sets—Some issues in knowledge representation

Didier Dubois, Henri Prade · Fuzzy Sets and Systems · 1987 · 214 citations · Full text

Computing, Computer Science, Mathematics +8

Linguistic modifiers and imprecise categories

Bernadette Bouchon‐Meunier, Jia Yao · International Journal of Intelligent Systems · 1992 · 82 citations

Computing, Computer Science, Formal Methods +11