References
- Atiyah , M. F. and MacDonald , I. G. 1969 . Introduction to Commutative Algebra
- Corsini , P. 1993 . Prolegomena of hypergroup theory , Udine : Aviani Editore .
- Kyuno , S. and Stefanescu , M. 1993 . 5th Int. Congress Algebraic Hyperstructure and Applications 215 – 221 .
- De Salvo , M. 1985 . Iperanelli ed ipercorpi . Ann. Sci. Univ. Clermont II, Ser. Math. , 22 : 89 – 107 .