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@article{INTD_1985_26_a1, author = {G. L. Litvinov}, title = {Hypergroups and hypergroup algebras}, journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya}, pages = {57--106}, publisher = {mathdoc}, volume = {26}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/INTD_1985_26_a1/} }
G. L. Litvinov. Hypergroups and hypergroup algebras. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 26 (1985), pp. 57-106. http://geodesic.mathdoc.fr/item/INTD_1985_26_a1/