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M. S. Baouendi,1 J. Sjöstrand2 1Department of Mathematics, Purdue University; Université Paris VI 2Department of Mathematics, Purdue University; Purdue University et Université Paris — Sud
M. S. Baouendi, J. Sjöstrand "Régularité analytique pour des opérateurs elliptiques singuliers en un point," Arkiv för Matematik, Ark. Mat. 14(1-2), 9-33, (December 1976)