@article{ASUO_2016_XXIV_3_a9,
     author = {Piergiulio Corsini},
     title = {HX-groups and {Hypergroups}},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXIV},
     number = {3},
     year = {2016},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2016_XXIV_3_a9/}
}