Geodesic
The global smoothness of the solutions of a class of degenerating elliptic equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 5 
A. V. Fursikov. The global smoothness of the solutions of a class of degenerating elliptic equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 5. http://geodesic.mathdoc.fr/item/RM_1971_26_5_a15/
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     title = {The global smoothness of the solutions of a~class of degenerating elliptic equations},
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     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_5_a15/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[2] I. Ts. Gokhberg, M. G. Krein, Vvedenie v teoriyu nesamosopryazhennykh operatorov, «Nauka», M., 1965

[3] V. V. Grushin, “Ob odnom klasse gipoellipticheskikh operatorov”, Matem. sb., 83(125):3 (1970), 456–473 | Zbl

[4] A. V. Fursikov, “Ob odnom klasse vyrozhdayuschikhsya ellipticheskikh operatorov”, Matem. sb., 79 (121):3 (1969), 381–404 | MR | Zbl