@article{NSJOM_1981_11_Nonea_24,
     author = {Bogdanovi\'c Stojan},
     title = {Semigroups in {Which} some bi-ideal is a group},
     journal = {Novi Sad Journal of Mathematics},
     pages = {261-266},
     year = {1981},
     volume = {11},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_24/}
}