Geodesic
The Cauchy problem for equations of the first order with respect to time and with two independent variables
Sbornik. Mathematics, Tome 5 (1968) no. 2, pp. 147-158 
Yu. V. Sidorov. The Cauchy problem for equations of the first order with respect to time and with two independent variables. Sbornik. Mathematics, Tome 5 (1968) no. 2, pp. 147-158. http://geodesic.mathdoc.fr/item/SM_1968_5_2_a0/
@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},
     year = {1968},
     volume = {5},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_5_2_a0/}
}
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