References
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- Prolegomena of hypergroup(second edition) P.Corsini;Aviani(ed.)
- Rendiconti Math. S. Ⅶ v.9 From groupoids to groups through hypergroups P.Corsini;T.Vougiouklis
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Fuzzy sets and systems
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$H_v$ -groups B.Davvaz -
$8^{iem}$ congres Math. scandinaves Sur une generalization de la notion de groupe F.Marty - J. Math. Anal. v.35 Fuzzy groups A.Rosenfeld
- Hyperstructures and their representations T.Vougiouklis
- Proc. 4th Internat. Congress, Algebraic Hyperstructures & Appl., Xanthi, Greec, 1990 The fundamental relations in hyperrings. The general hygerfield T.Vougiouklis
- Inform. and Control v.8 Fuzzy sets L.A.Zadeh