@article{MR_1981_23_a3,
     author = {Jean Mittas},
     title = {Hypergroupes {Canoniques} {Values} et {Hypervalues-Hypergroupes} {Fortement} et {Superieurement} {Canoniques}},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}},
     pages = {55--88},
     year = {1981},
     volume = {23},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1981_23_a3/}
}