@article{TRSPY_1971_112_a6,
     author = {A. V. Bitsadze},
     title = {On the theory of first order quasilinear ordinary differential equations},
     journal = {Informatics and Automation},
     pages = {95--104},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a6/}
}