@article{PIM_1970_N_S_10_24_a17,
     author = {Petar M. Vasi\'c and Radovan R. Jani\'c},
     title = {On {An} {Inequality} {Of} {N.} {Levinson}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {155 },
     publisher = {mathdoc},
     volume = {_N_S_10},
     number = {24},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/PIM_1970_N_S_10_24_a17/}
}