@article{RM_1972_27_5_a21,
author = {O. A. Oleinik and E. V. Radkevich},
title = {Systems of differential equations that have nonanalytic solutions},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1972},
volume = {27},
number = {5},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1972_27_5_a21/}
}
O. A. Oleinik; E. V. Radkevich. Systems of differential equations that have nonanalytic solutions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 5. http://geodesic.mathdoc.fr/item/RM_1972_27_5_a21/
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