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On the global real analyticity of solutions to $$\square_b$$ on compact manifolds. (English) Zbl 0334.35013
Commun. partial differ. Equations 1, 283-311 (1976).

##### MSC:
 35D10 Regularity of generalized solutions of PDE (MSC2000) 35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation