@article{MV_1971_23_1_a25,
     author = {M. Niki\'c},
     title = {Neke oblasti u $C^{2}$},
     journal = {Matemati\v{c}ki vesnik},
     pages = {205 },
     year = {1971},
     volume = {23},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1971_23_1_a25/}
}