Geodesic
On local unsolvability and nonhypoellipticity of (pseudo-) differential equations with weighted symbols
Sbornik. Mathematics, Tome 47 (1984) no. 2, pp. 541-556 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper develops a procedure which enables one to construct microlocal asymptotic solutions of (pseudo-) differential equations with weighted symbols. Some theorems concerning local unsolvability and nonhypoellipticity are proved. Bibliography: 7 titles. 
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     title = {On local unsolvability and nonhypoellipticity of (pseudo-) differential equations with weighted symbols},
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N. A. Shananin. On local unsolvability and nonhypoellipticity of (pseudo-) differential equations with weighted symbols. Sbornik. Mathematics, Tome 47 (1984) no. 2, pp. 541-556. http://geodesic.mathdoc.fr/item/SM_1984_47_2_a15/

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[7] Khërmander L., Lineinye differentsialnye uravneniya s chastnymi proizvodnymi, Mir, M., 1965