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Subelliptic operators. (English) Zbl 0446.35086

Seminar on singularities of solutions of linear partial differential equations, Inst. Adv. Study, Princeton 1977-78, Ann. Math. Stud. 91, 127-208 (1979).

MSC:

35S05 Pseudodifferential operators as generalizations of partial differential operators
47F05 General theory of partial differential operators
47Gxx Integral, integro-differential, and pseudodifferential operators