@article{EMJ_2020_11_3_a2,
     author = {D. Heidari and B. Davvaz},
     title = {Characterization of polygroups by {IP-subsets}},
     journal = {Eurasian mathematical journal},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2020_11_3_a2/}
}