Geodesic
The classical limit of solutions of the Cauchy problem for hypoelliptic Weyl symbols
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 5 
M. A. Antonets. The classical limit of solutions of the Cauchy problem for hypoelliptic Weyl symbols. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 5. http://geodesic.mathdoc.fr/item/RM_1977_32_5_a6/
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     author = {M. A. Antonets},
     title = {The classical limit of solutions of the {Cauchy} problem for hypoelliptic {Weyl} symbols},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1977},
     volume = {32},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_5_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] F. A. Berezin, “Ob odnom predstavlenii operatorov s pomoschyu funktsionalov”, Trudy MMO, 17 (1967), 117–196 | MR | Zbl

[2] F. A. Berezin, M. A. Shubin, Lektsii po kvantovoi mekhanike, MGU, M., 1972

[3] M. A. Shubin, “Psevdodifferentsialnye operatory v $R^n$”, DAN, 196:2 (1971) | Zbl