@article{PIM_1975_N_S_18_32_a11,
     author = {Dragica N. Krgovi\'c},
     title = {On (m, {n)-Regular} {Semigroups}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {107 },
     publisher = {mathdoc},
     volume = {_N_S_18},
     number = {32},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/PIM_1975_N_S_18_32_a11/}
}