Geodesic
On local unsolvability and nonhypoellipticity of (pseudo-) differential equations with weighted symbols
Sbornik. Mathematics, Tome 47 (1984) no. 2, pp. 541-556

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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. 
@article{SM_1984_47_2_a15,
     author = {N. A. Shananin},
     title = {On local unsolvability and nonhypoellipticity of (pseudo-) differential equations with weighted symbols},
     journal = {Sbornik. Mathematics},
     pages = {541--556},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1984_47_2_a15/}
}
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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/