@article{PIM_1959_S_S_XIII_13_a5,
     author = {Svetozar Kurepa},
     title = {On {The} {Quadratic} {Functional}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {57 },
     publisher = {mathdoc},
     volume = {_S_S_XIII},
     number = {13},
     year = {1959},
     url = {http://geodesic.mathdoc.fr/item/PIM_1959_S_S_XIII_13_a5/}
}