Geodesic
Conditions for the local solvability of equations of principal type
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 3 
Yu. V. Egorov. Conditions for the local solvability of equations of principal type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 3. http://geodesic.mathdoc.fr/item/RM_1971_26_3_a9/
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     title = {Conditions for the local solvability of equations of principal type},
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[1] Yu. V. Egorov, “O dostatochnykh usloviyakh lokalnoi razreshimosti psevdodifferentsialnykh uravnenii”, UMN, 25:3 (153) (1970), 269–270 | MR | Zbl

[2] Yu. V. Egorov, “Ob usloviyakh razreshimosti psevdodifferentsialnykh uravnenii”, DAN, 187:6 (1969), 1232–1234 | MR | Zbl

[3] Yu. V. Egorov, “O subellipticheskikh psevdodifferentsialnykh operatorakh”, DAN, 188:1 (1969), 20–22 | MR | Zbl

[4] Yu. V. Egorov, “O strukture skalyarnykh subellipticheskikh operatorov”, DAN, 1971

[5] L. Hörmander, “Pseudo-differential operators and nonelliptic boundary problems”, Ann. of Math., 83:1 (1966), 129–209 | DOI | MR | Zbl

[6] L. Nirenberg, F. Treves, “On local solvability of linear partial differential aquations. I: Necessary conditions”, Comm. Pure Appl. Math., 23:1 (1970), 1–38 | DOI | MR | Zbl