@article{PIM_1977_N_S_22_36_a16,
     author = {Jovan D. Ke\v{c}ki\'c and Vlajko Lj. Koci\'c},
     title = {Oscillating {Solutions} {Of} {Linear} {Diffrential} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {135 },
     publisher = {mathdoc},
     volume = {_N_S_22},
     number = {36},
     year = {1977},
     url = {http://geodesic.mathdoc.fr/item/PIM_1977_N_S_22_36_a16/}
}