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REFERENCES
| R. Bayon and N. Lygeros, Les hypergroupes et Hv-groupes d'ordre 3, submitted to Bulletin of the Greek Mathematical Society.
Th. Vougiouklis, The fundamental relation in hyperrings: The general hyperfield, Fourth Int. Congress Algebraic Hyperstructures and Appl. (AHA), 1991, pp. 203-211.
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