Geodesic
$T$-product of hypoelliptic operators
Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Itogi Nauki i Tekhniki. Seriya "Sovremennye Problemy Matematiki", Tome 8 (1977), pp. 137-197 
V. P. Maslov; I. A. Shishmarev. $T$-product of hypoelliptic operators. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Itogi Nauki i Tekhniki. Seriya "Sovremennye Problemy Matematiki", Tome 8 (1977), pp. 137-197. http://geodesic.mathdoc.fr/item/INTD_1977_8_a2/
@article{INTD_1977_8_a2,
     author = {V. P. Maslov and I. A. Shishmarev},
     title = {$T$-product of hypoelliptic operators},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {137--197},
     year = {1977},
     volume = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTD_1977_8_a2/}
}
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