Geodesic
Differential equations that have nonanalytic solutions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1 
M. D. Bronshtein. Differential equations that have nonanalytic solutions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1. http://geodesic.mathdoc.fr/item/RM_1975_30_1_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] O. A. Oleinik, E. V. Radkevich, “Ob analitichnosti reshenii lineinykh uravnenii s chastnymi proizvodnymi”, Matem. sb., 90:4 (1973), 592–606 | MR

[2] O. A. Oleinik, E. V. Radkevich, “Ob odnom klasse lineinykh differentsialnykh uravnenii, imeyuschikh neanaliticheskie resheniya”, UMN, 28:3 (1973), 191–192 | MR | Zbl

[3] L. Khërmander, Lineinye differentsialnye operatory s chastnymi proizvodnymi, Mir, M., 1965 | MR

[4] M. D. Bronshtein, L. G. Zaletova, V. R. Fridlender, “O zadache Gursa dlya nelineinykh sistem nad prostranstvami Zhevre”, Matematika. Izv. vuzov, 1974, no. 4, annotatsiya