The symbols of one-parameter semigroups $e^{tA}$ as $t\to 0$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 4
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@article{RM_1974_29_4_a16,
author = {V. P. Maslov and A. I. Shishmarev},
title = {The symbols of one-parameter semigroups~$e^{tA}$ as $t\to 0$},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1974},
volume = {29},
number = {4},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1974_29_4_a16/}
}
V. P. Maslov; A. I. Shishmarev. The symbols of one-parameter semigroups $e^{tA}$ as $t\to 0$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 4. http://geodesic.mathdoc.fr/item/RM_1974_29_4_a16/
[1] L. Khermander, “Psevdodifferentsialnye operatory i gipoellipticheskie uravneniya”, Psevdodifferentsialnye operatory, «Mir», M., 1967 | MR