|
Differential operators of principal type
L. Hörmander
Citation:
L. Hörmander, “Differential operators of principal type”, Matematika, 5:5 (1961), 89–114; Math. Ann., 140:2 (1960), 124–146
Linking options:
https://www.mathnet.ru/eng/mat195 https://www.mathnet.ru/eng/mat/v5/i5/p89
|
|