Rockland, Charles Hypoellipticity and eigenvalue asymptotics Charles Rockland - Berlin New York Springer-Verlag 1975 - 171 p 25 cm - Lecture notes in mathematics ; 464 . - Lecture notes in mathematics (Springer-Verlag) . Contine bibliogr eng ISBN: 038707175X LCCN: 75016382 Subjects--Topical Terms: Differential equations, PartialDifferential equations, HypoellipticEigenvaluesAsymptotic expansions Dewey Class. No.: 510.8 515.353