L. Hörmander, “Differential operators of principal type”, Matematika, 1961, Volume 5, Issue 5,Pages <nobr>89–114</nobr>

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Matematika, 1961 Volume 5, Issue 5, Pages 89–114 (Mi mat195)

Differential operators of principal type

L. Hörmander

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English version: , 1960, 140:2, 124–146

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