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Hypoelliptic differential operators. (English) Zbl 0099.30101


References:

[1] [1] , On the theory of general partial differential operators. Acta Math., 94, 1955, pp. 161-248. · Zbl 0067.32201
[2] [2] , On interior regularity of the solutions of partial differential equations, Comm. Pure Appl. Math., 11, 1958, pp. 197-218. · Zbl 0081.31501
[3] [3] , Sur une classe d’opérateurs différentiels hypoelliptiques, Bull. Soc. Math. France, 85, 1957, pp. 283-306. · Zbl 0082.09303
[4] [4] , Théorèmes de régularité pour quelques classes d’opérateurs différentiels, Thesis, Lund, 1959. · Zbl 0139.28402
[5] [5] , Théorie des distributions, I-II, Paris, 1950-1951. · Zbl 0042.11405
[6] [6] , Opérateurs différentiels hypoelliptiques, Ann. Inst. Fourier, Grenoble, 9, 1959, pp. 1-73. · Zbl 0197.36602
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