@article{BMMS_2010_33_3_a3,
     author = {B. Davvaz},
     title = {Isomorphism {Theorems} of {Polygroups}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2010},
     volume = {33},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2010_33_3_a3/}
}