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On differential equations of subprincipal type. (English. Russian original) Zbl 0512.58033
Sov. Math., Dokl. 26, 221-223 (1982); translation from Dokl. Akad. Nauk SSSR 265, 1078-1081 (1982).
MSC:
58J40 Pseudodifferential and Fourier integral operators on manifolds
35S05 Pseudodifferential operators as generalizations of partial differential operators
58J15 Relations of PDEs on manifolds with hyperfunctions
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