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doi: 10.1007/bf02826100
handle: 2318/28070
Summary: The theory of multi-quasi-elliptic operators and associated Sobolev spaces is revised in this article and possible directions for research are indicated concerning operators of principal type and nonlinear equations. Moreover, some new results concerning operators with anti-Wick symbols are presented.
Quasielliptic equations
Quasielliptic equations
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