@article{RM_1971_26_3_a9,
author = {Yu. V. Egorov},
title = {Conditions for the local solvability of equations of principal type},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1971},
volume = {26},
number = {3},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1971_26_3_a9/}
}
Yu. V. Egorov. Conditions for the local solvability of equations of principal type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 3. http://geodesic.mathdoc.fr/item/RM_1971_26_3_a9/
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