L. V. Hörmander, “Hypoelliptic differential equations of second order”, Matematika, 1968, Volume 12, Issue 2,Pages <nobr>88–109</nobr>

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Matematika, 1968 Volume 12, Issue 2, Pages 88–109 (Mi mat463)

Hypoelliptic differential equations of second order

L. V. Hörmander

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