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Analysis of degenerate elliptic operators of Grušin type
Comparison of the classical BMO with the BMO spaces associated with operators and applications
Degenerate elliptic operators in one dimension
Gaussian heat kernel upper bounds via the Phragmén-Lindelöf theorem
Riesz meets Sobolev
Second-order operators with degenerate coefficients
Small time asymptotics of diffusion processes