@article{NM_2007_LII_4_a1,
     author = {Marko Obradovi\'c and Ljubica Pofuk},
     title = {Problemska nastava},
     journal = {Nastava matematike},
     pages = {12 },
     publisher = {mathdoc},
     volume = {LII},
     number = {4},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NM_2007_LII_4_a1/}
}