@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/}
}