Geodesic
A generalization of the concept of characteristics for $A$-pseudodifferential operators with operator-valued symbol
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 6 
V. P. Maslov. A generalization of the concept of characteristics for $A$-pseudodifferential operators with operator-valued symbol. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 6. http://geodesic.mathdoc.fr/item/RM_1970_25_6_a12/
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     title = {A~generalization of the concept of characteristics for $A$-pseudodifferential operators with operator-valued symbol},
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     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_6_a12/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] V. P. Maslov, Teoriya vozmuschenii i asimptoticheskie metody, MGU, M., 1965

[2] V. P. Maslov, “O regulyarizatsii zadachi Koshi dlya psevdodifferentsialnykh operatorov”, DAN, 177:6 (1967) | Zbl