@article{RM_1977_32_5_a13,
author = {Yu. V. Egorov},
title = {The smoothness of the solutions of equations of principal type},
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_a13/}
}
Yu. V. Egorov. The smoothness of the solutions of equations of principal type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 5. http://geodesic.mathdoc.fr/item/RM_1977_32_5_a13/
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