Geodesic
On necessary conditions for the local solvability of equations of quasiprincipal type
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 2 
N. A. Shananin. On necessary conditions for the local solvability of equations of quasiprincipal type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 2. http://geodesic.mathdoc.fr/item/RM_1977_32_2_a21/
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     author = {N. A. Shananin},
     title = {On necessary conditions for the local solvability of equations of quasiprincipal type},
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     year = {1977},
     volume = {32},
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     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_2_a21/}
}
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[1] L. Khermander, Lineinye differentsialnye operatory s chastnymi proizvodnymi, Mir, M., 1965 | MR

[2] F. Trev, “O lokalnoi razreshimosti lineinykh differentsialnykh uravnenii s chastnymi proizvodnymi”, UMN, 29:2 (1974), 252–281 | MR | Zbl

[3] Yu. V. Egorov, “O razreshimosti differentsialnykh uravnenii s prostymi kharakteristikami”, UMN, 26:2 (1971), 183–198 | MR | Zbl