@article{MABA_2000_14_1-2_a3,
     author = {B. Davvaz},
     title = {On {Polygroups} and {Permutation} {Polygroups}},
     journal = {Mathematica balkanica},
     pages = {41},
     publisher = {mathdoc},
     volume = {14},
     number = {1-2},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/MABA_2000_14_1-2_a3/}
}