Multiplication operators on Bergman spaces. Sheldon Axler — 1982 Journal für die reine und angewandte Mathematik
The Berezin transform on the Toeplitz algebra Sheldon Axler; Dechao Zheng — 1998 Studia Mathematica This paper studies the boundary behavior of the Berezin transform on the C*-algebra generated by the analytic Toeplitz operators on the Bergman space.
Putnam's Theorem, Alexander's Spectral Area Estimate, and VMO. Sheldon Axler; Shapiro Joel H. — 1985 Mathematische Annalen