Geodesic
The analyticity of the solutions of a certain class of second order hypoelliptic equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 6 
O. A. Oleinik; E. V. Radkevich. The analyticity of the solutions of a certain class of second order hypoelliptic equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 6. http://geodesic.mathdoc.fr/item/RM_1972_27_6_a16/
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[1] O. A. Oleinik, E. V. Radkevich, “Uravneniya vtorogo poryadka s neotritsatelnoi kharakteristicheskoi formoi”, Itogi nauki. Matematicheskii analiz 1969, VINITI AN, M., 1971 | MR | Zbl

[2] C. Morrey, L. Nirenberg, “On the analyticity of the solutions of linear elliptic systems of partial differential equations”, Comm. Pure Appl. Math., 10 (1957), 271–290 | DOI | MR | Zbl

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

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

[5] H. Lewy, “Über der analytischen Charakter der Lösungen elliptischer Differentialgleichungen”, Nachrichten von der Gesellschaft der Wissenschaften zu Göttingen, Math.- Phys. Kl., 1927, 178–186 | Zbl