1. Join Geometries;Prenowitz,1979
2. Projective geometries as multigroups;Prenowitz;Am. J. Math.,1943
3. Sur une généralization de la notion de groupe;Marty,1934
4. Algebraic hyperstructures of soft sets associated to semihypergroups;Anvariyeh;Southeast Asian Bull. Math.,2011
5. On semihypergroup and hypergroup homomorphisms;Bonansinga;Boll. Un. Mat. Ital. B,1982