1. A. Abanov, C. Bénéteau, D. Khavinson, and R. Teodorescu. A free boundary problem associated with the isoperimetric inequality. arXiv:1601.03885, 2016. preprint.
2. Catherine Bénéteau and Dmitry Khavinson. The isoperimetric inequality via approximation theory and free boundary problems. Comput. Methods Funct. Theory, 6(2):253–274, 2006.
3. J. J. Carmona. Mergelyan’s approximation theorem for rational modules. Journal Approx. Theory, 44(2):113–126, 1985.
4. Peter L. Duren. Theory of H p Spaces, volume 38 of Pure and Applied Mathematics. Academic Press, New York-London, 1970.
5. M. Fleeman and D. Khavinson. Approximating z ¯ $$\overline z$$ in the Bergman space, to appear. volume 79 of Contemp. Math., pages 79–90. Amer. Math. Soc., Providence, RI. arXiv:1509.01370.