Geodesic
Hypoelliptic operators with multiple characteristics
Sbornik. Mathematics, Tome 8 (1969) no. 2, pp. 181-205 
E. V. Radkevich. Hypoelliptic operators with multiple characteristics. Sbornik. Mathematics, Tome 8 (1969) no. 2, pp. 181-205. http://geodesic.mathdoc.fr/item/SM_1969_8_2_a3/
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[1] L. Khërmander, “Psevdodifferentsialnye operatory i neellipticheskie kraevye zadachi”, Psevdodifferentsialnye operatory, Mir, M., 1967, 166–296

[2] L. Khërmander, “Gipoellipticheskie uravneniya”, Psevdodifferentsialnye operatory, Mir, M., 1967, 297–367 | MR

[3] Yu. V. Egorov, “O psevdodifferentsialnykh operatorakh glavnogo tipa”, DAN SSSR, 171:4 (1966), 778–780 | MR | Zbl

[4] Yu. V. Egorov, “Psevdodifferentsialnye operatory glavnogo tipa”, Matem. sb., 73(115):3 (1967), 356–374 | MR | Zbl

[5] E. V. Radkevich, “Vnutrennie otsenki tipa Shaudera dlya nekotorogo klassa psevdodifferentsialnykh operatorov s kratnymi kharakteristikami”, Uspekhi matem. nauk, XXIV:1(145) (1969), 199–200

[6] Dzh. Kon, L. Nirenberg, “Algebra psevdodifferentsialnykh operatorov”, Psevdodifferentsialnye operatory, Mir, M., 1967, 9–62 | MR