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Maslov’s canonical operator method. (Russian) Zbl 0404.35096
Complex analysis and manifolds, Work Collect., Acad. Sci. Ukr. SSR, Inst. Math., Kiev, 47-113 (1978).
58Jxx Partial differential equations on manifolds; differential operators
35C99 Representations of solutions to partial differential equations
35S05 Pseudodifferential operators as generalizations of partial differential operators