Geodesic
A certain class of linear differential equations that have nonanalytic solutions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 3 
O. A. Oleinik; E. V. Radkevich. A certain class of linear differential equations that have nonanalytic solutions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 3. http://geodesic.mathdoc.fr/item/RM_1973_28_3_a19/
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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 differentsialnykh uravnenii i sistem”, DAN, 207:4 (1972) | MR | Zbl

[2] O. A. Oleinik, E. V. Radkevich, “O sistemakh differentsialnykh uravnenii, imeyuschikh neanaliticheskie resheniya”, UMN, 27:5 (1972), 247–248 | MR | Zbl

[3] O. A. Oleinik, E. V. Radkevich, “Ob analitichnosti reshenii lineinykh uravnenii s chastnymi proizvodnymi”, Matem. sb., 90(132):4 (1973), 592–606 | MR | Zbl

[4] I. G. Petrovskii, “Sur l'analyticité des solutions des systems d'equations differentielles”, Matem. sb., 5:1 (1939), 3–70

[5] I. G. Petrovskii, “Über das Gauchysche Problem für System von partiellen Differentialgleichungen”, Matem. sb., 2(44):5 (1937), 815–870 | Zbl

[6] J. Leray, Hyperbolic differential equations, The Institute for Advanced Study, Princeton, N. J., 1952 | MR

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