@article{SM_1968_5_2_a0,
     author = {Yu. V. Sidorov},
     title = {The {Cauchy} problem for equations of the first order with respect to time and with two independent variables},
     journal = {Sbornik. Mathematics},
     pages = {147--158},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_5_2_a0/}
}