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T-Product of Hypoelliptic Operators
Journal of Soviet Mathematics, 1980Victor Maslov, I A Shishmarev
exaly
A Matrix Differential Harnack Estimate for a Class of Hypoelliptic Evolution Equations
Archiv Der MathematikBin Qian
exaly
Analytic‐hypoelliptic partial differential equations of principal type
Communications on Pure and Applied Mathematics, 1971openaire +1 more source