Geodesic
Elliptic pseudodifferential equations with a first order degeneracy
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 4 
G. I. Èskin. Elliptic pseudodifferential equations with a first order degeneracy. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 4. http://geodesic.mathdoc.fr/item/RM_1970_25_4_a18/
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     title = {Elliptic pseudodifferential equations with a~first order degeneracy},
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     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_4_a18/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] V. G. Mazya, B. P. Paneyakh, “Vyrozhdayuschiesya ellipticheskie psevdodifferentsialnye operatory s prostymi kompleksnymi kharakteristikami”, UMN, 25:1 (1970), 193–194 | MR

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

[3] G. I. Eskin, “Vyrozhdayuschiesya ellipticheskie psevdodifferentsialnye uravneniya glavnogo tipa”, Matem. sb., 82(124):4(8) (1970), 585–628 | MR

[4] M. I. Vishik, V. V. Grushin, “Ellipticheskie psevdodifferentsialnye operatory na zamknutom mnogoobrazii, vyrozhdayuschiesya na podmnogoobrazii”, DAN, 189:1 (1989), 16–19