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@article{DAN_1976_226_5_a7, author = {I. A. Shishmarev}, title = {On asymptotic behavior as $t\to0$ and $T$-product for hypoelliptic systems}, journal = {Doklady Akademii Nauk}, pages = {1018--1020}, publisher = {mathdoc}, volume = {226}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_5_a7/} }
I. A. Shishmarev. On asymptotic behavior as $t\to0$ and $T$-product for hypoelliptic systems. Doklady Akademii Nauk, Tome 226 (1976) no. 5, pp. 1018-1020. http://geodesic.mathdoc.fr/item/DAN_1976_226_5_a7/