Rockland ,C. (1975). Hypoellipticity and Eigenvalue Asymptotics. Springer-Verlag.
Chicago Edition CitationRockland ,C. Hypoellipticity and Eigenvalue Asymptotics. Berlin: Springer-Verlag, 1975.
Deismireacht MLARockland ,C. Hypoellipticity and Eigenvalue Asymptotics. Springer-Verlag, 1975.
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