1. J. Bezdek and J. Harris, Fuzzy partitions and relations: an axiomatic basis for clustering, Fuzzy Sets and Systems, 1 (1978), pp. 112–127.
2. Soft Computing Series;G. Cattaneo,1998
3. G. Cattaneo, M. L. D. Chiara, and R. Giuntini, Some algebraic structures for many-valued logics. accepted in Tatra Mountains Mathematical Publication, 1998.
4. G. Cattaneo, R. Giuntini, and R. Pilla, BZMVdMand Stonian MV algebras (applications to fuzzy sets and rough approximations). in print in Fuzzy Sets Syst., 1998.
5. G. Cattaneo and G. Marino, Brouwer-Zadeh posets and fuzzy set theory, in Proceedings of the 1st Napoli Meeting on Fuzzy Systems, A. D. Nola and A. Ventre, eds., Napoli, June 1984, pp. 34–58.