@article{PIM_1979_N_S_25_39_a24,
     author = {Bogdan Rzepecki},
     title = {On {Some} {Classes} {Of} {Differential} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {157 },
     publisher = {mathdoc},
     volume = {_N_S_25},
     number = {39},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/PIM_1979_N_S_25_39_a24/}
}