1. Abstraction and pattern classification;Bellman;J. Math. Anal. Appl.,1966
2. A note on fuzzy sets;Brown;Inform. Control,1971
3. R. M. Capocelli and A. De Luca, Fuzzy sets and decision theory, preprint.
4. Fuzzy topological spaces;Chang;J. Math. Anal. Appl.,1968
5. Algorithmic aspects in complex systems analysis;De Luca;Scientia,1971