@article{NM_2006_LI_3-4_a5,
     author = {Milorad Belji\'c},
     title = {Kosinusna teorema za tetraedar},
     journal = {Nastava matematike},
     pages = {40 },
     publisher = {mathdoc},
     volume = {LI},
     number = {3-4},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NM_2006_LI_3-4_a5/}
}