@article{PIM_1981_N_S_30_44_a1,
     author = {Antal Balog},
     title = {On a {Conjecture} of {A.} {Ivi\'c} and {W.} {Schwarz}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {11 },
     publisher = {mathdoc},
     volume = {_N_S_30},
     number = {44},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_30_44_a1/}
}