@article{RM_1975_30_5_a14,
author = {V. Ya. Ivrii},
title = {Correctness in {Gevrey} classes of the {Cauchy} problem for not strictly hyperbolic operators},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1975},
volume = {30},
number = {5},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1975_30_5_a14/}
}
V. Ya. Ivrii. Correctness in Gevrey classes of the Cauchy problem for not strictly hyperbolic operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 5. http://geodesic.mathdoc.fr/item/RM_1975_30_5_a14/
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