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Analytic semigroups generated by globally hypoelliptic operators
Integral Transforms and Special Functions, 2006exaly
On the essential spectrum of hypoelliptic pseudo‐differential operators
Mathematische Nachrichten, 2008exaly
The Spectral Theory of Perturbed Hypoelliptic Operators
Proceedings of the London Mathematical Society, 1977openaire +1 more source
The Spectrum of a Hypoelliptic Operator with a Potential Perturbation
Bulletin of the London Mathematical Society, 1975openaire +2 more sources
Normal Solvability and Fredholm Properties for Regular Hypoelliptic Operators
Trends in Mathematicsexaly