Multi-valued Connectives for Fuzzy Sets - Athanasios Kehagias; K. Serafimidis (CoRR, 2003)

The L-fuzzy Nakano hypergroup. - Athanasios Kehagias; K. Serafimidis (Inf. Sci., 2005)

Some remarks on congruences obtained from the L-fuzzy Nakano hyperoperation. - K. Serafimidis; Athanasios Kehagias (Inf. Sci., 2006)