Rockland, C. (1975). Hypoellipticity and eigenvalue asymptotics. Springer.
Chicago Style (17th ed.) CitationRockland, Charles. Hypoellipticity and Eigenvalue Asymptotics. Berlin: Springer, 1975.
MLA (9th ed.) CitationRockland, Charles. Hypoellipticity and Eigenvalue Asymptotics. Springer, 1975.