@article{PIM_1978_N_S_24_38_a12,
     author = {Jovan D. Ke\v{c}ki\'c and V. LJ. Koci\'c},
     title = {Second {Order} {Nonlinear} {Differential} {Equations} {Equivalent} {To} {Linear} {Differential} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {99 },
     publisher = {mathdoc},
     volume = {_N_S_24},
     number = {38},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/PIM_1978_N_S_24_38_a12/}
}