@article{MV_1972_24_1_a22,
     author = {D. N. Krgovi\'c},
     title = {O (f,g)- prstenima},
     journal = {Matemati\v{c}ki vesnik},
     pages = {151 },
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a22/}
}