Sheldon Axler. Harmonic Function Theory software, a Mathematica package for symbolic manipulation of harmonic functions, version 10.00, 12 November 2015 (previous versions released in 1992, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2003, 2008, 2009, 2012, and 2013).
Sheldon Axler. Linear Algebra Done
Right, third edition, Undergraduate Texts in
Mathematics, Springer, 2015.
Sheldon Axler. Toeplitz operators, A Glimpse at Hilbert Space Operators (edited by Sheldon Axler, Peter Rosenthal, and Donald Sarason), Birkhäuser, 2010, 125-133.
Sheldon Axler. Mathematicians versus the silicon age: Who wins?, Mathematical Adventures for Students and Amateurs, edited by David F. Hayes and Tatiana Shubin, Mathematical Association of America (2004), 17-25.
Sheldon Axler. Hankel operators on Bergman spaces, Linear and Complex Analysis Problem Book 3, part I (edited by V. P. Havin and N. K. Nikolski), Springer Lecture Notes in
Mathematics, 1994, 351-353.
Sheldon Axler. Paul Halmos and Toeplitz operators, Paul Halmos: Celebrating 50 Years of
Mathematics (edited by John H. Ewing and F. W. Gehring), Springer, 1991,
257-263.
Sheldon Axler. Bergman spaces and their operators, Surveys of Some Recent Results in
Operator Theory, volume I (edited by John B. Conway and Bernard B.
Morrel), Pitman Research Notes in Mathematics, 1988, 1-50.