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Hypoelliptic differential operators
L. Hörmander
Citation:
L. Hörmander, “Hypoelliptic differential operators”, Matematika, 7:1 (1963), 66–78; Ann. Inst. Fourier Grenoble, 11 (1961), 477–492
Linking options:
https://www.mathnet.ru/eng/mat250 https://www.mathnet.ru/eng/mat/v7/i1/p66
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