@article{ASCFM_1984__82_22_51_0,
     author = {Freni, Domenico},
     title = {Structure des hypergroupes quotients et des hypergroupes de type {U}},
     journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques},
     pages = {51--77},
     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {82},
     number = {22},
     year = {1984},
     mrnumber = {789305},
     zbl = {0587.20041},
     language = {fr},
     url = {http://www.numdam.org/item/ASCFM_1984__82_22_51_0/}
}