• Sectorial Forms and Unbounded Subnormals (with A. Athavale), Math Proc Cambridge Phil Soc, 143 (2007), 685-702
• On Operators Cauchy Dual to 2-hyperexpansive Operators: The Unbounded Case, Studia Math, 203 (2011), 129-162
• Operators Cauchy Dual to 2-hyperexpansive Operators: The Multivariable Case (With R. Curto), Integral Equations and Operator Theory, 73 (2012), 481-516
• Spherical Tuples of Hilbert Space Operators (With D. Yakubovich), Indiana University Mathematics Journal.

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