1. Dov Aharonov, Catherine Bénéteau, Dmitry Khavinson, and Harold Shapiro, Extremal problems for nonvanishing functions in Bergman Spaces, Selected Topics in Complex Analysis, Birkhäuser, Basel, 2005, pp. 59–86.
2. D. Aharonov and H. S. Shapiro, A minimal area problem in conformal mapping, Part I, Preliminary Report, TRITA-MAT-1973-7, Royal Institute of Technology, Stockholm.
3. D. Aharonov and H. S. Shapiro, A minimal area problem in conformal mapping, Part II, Preliminary Report, TRITA-MAT-1978-85, Royal Institute of Technology, Stockholm.
4. T. Sheil-Small, Area extremal problems for non-vanishing functions, Proc. Amer. Math. Soc. 139 (2011), 3231–3245.
5. T. Sheil-Small, Complex Polynomials, Cambridge University Press, Cambridge, 2002.