Geodesic
The problem of Cauchy for non-linear differential equations of the first order with discontinuous initial conditions
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 5 (1956), pp. 433-454 
O. A. Oleinik. The problem of Cauchy for non-linear differential equations of the first order with discontinuous initial conditions. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 5 (1956), pp. 433-454. http://geodesic.mathdoc.fr/item/MMO_1956_5_a9/
@article{MMO_1956_5_a9,
     author = {O. A. Oleinik},
     title = {The problem of {Cauchy} for non-linear differential equations of the first order with discontinuous initial conditions},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {433--454},
     year = {1956},
     volume = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1956_5_a9/}
}
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