Geodesic
Systems of differential equations that have nonanalytic solutions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 5 
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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Voir la notice de l'article provenant de la source Math-Net.Ru

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

[2] S. Mizochata, “Solutions nulles et solutions non analytique”, J. Math. Kyoto Univ., 1 (1962), 271–302 | MR

[3] F. Treves, “Analytic hypoelliptic partial differential equations of principal type”, Comm. Pure Appl. Math., 24 (1971) | MR

[4] V. V. Grushin, “Ob odnom klasse ellipticheskikh psevdodifferentsialnykh operatorov, vyrozhdayuschikhsya na podmnogoobrazii”, Matem. sb., 84:2 (1971), 163–195 | Zbl

[5] O. A. Oleinik, E. V. Radkevich, “Ob analitichnosti reshenii lineinykh differentsialnykh uravnenii i sistem”, DAN, 202:3 (1972) | Zbl

[6] M. S. Baouendi, C. Goulaouic, “Etude de l'analyticité et de la régularité Gevrey pour une classe d'opérateurs elliptiques dégénéres”, Ann. Sci. Ec. Norm. Sup., 4:1 (1971) | MR