@article{KJM_2007_30_1_a7,
     author = {Milena Leki\'c and Miloje Rajovi\'c},
     title = {On the oscillations of the solutions of the equation},
     journal = {Kragujevac Journal of Mathematics},
     pages = {119 - 129},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {2007},
     zbl = {1224.34101},
     url = {http://geodesic.mathdoc.fr/item/KJM_2007_30_1_a7/}
}