Geodesic
The smoothness of the solutions of equations of principal type
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 5 
Yu. V. Egorov. The smoothness of the solutions of equations of principal type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 5. http://geodesic.mathdoc.fr/item/RM_1977_32_5_a13/
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     title = {The smoothness of the solutions of equations of principal type},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] J. J. Duistermaat, L. Hörmander, “Fourier integral operators, II”, Acta Math., 128:3–4 (1972), 183–269 | DOI | MR | Zbl

[2] L. Hörmander, “On the existence and the regularity of solutions of linear $p-d$ equations”, L' Enseignement Math., 17:2 (1971), 99–163 | MR | Zbl

[3] F. Treves, “Hypoelliptic partial differential equations of principal type”, Comm. Pure Appl. Math., 24:5 (1971), 631–670 | DOI | MR | Zbl

[4] Yu. V. Egorov, “Subellipticheskie operatory”, UMN, 30:2 (1975), 57–114 | MR | Zbl

[5] F. Treves, “Existence et régularité des solutions des équations aux dérivées partielles linéaires”, Seminaire Goulaouic-Schwartz, Paris, 1972–73

[6] Yu. V. Egorov, “Novoe dokazatelstvo teoremy o lokalnoi razreshimosti uravnenii s prostymi veschestvennymi kharakteristikami”, UMN, 32:2 (1976), 211–212