@article{MZ_1992__210_1_174423,
     author = {A.R. Medghalich},
     title = {The second dual algebra of a hypergroup.},
     journal = {Mathematische Zeitschrift},
     pages = {615--624},
     publisher = {mathdoc},
     volume = {210},
     number = {1},
     year = {1992},
     zbl = {0755.43001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174423/}
}