Rockland, Charles, 1947- 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); 464. . Bibliography: p. [168]-171. ISBN: 038707175X : DM20.00 LCCN: 75016382 //r85 Subjects--Topical Terms: Differential equations, Partial.Differential equations, Hypoelliptic.Eigenvalues.Asymptotic expansions. Dewey Class. No.: 510/.8 s 515/.353