1. L. Ahlfors,Complex Analysis, 3rd edn., McGraw-Hill, New York, 1979.
2. N. I. Akhiezer,Lectures on Approximation Theory, 2nd edn., Nauka, Moscow, 1965 (in Russian); German transi.: Akademie-Verlag, Berlin, 1967.
3. N. I. Akhiezer,Elements of the Theory of Elliptic Functions, 2nd edn., Nauka, Moscow, 1970 (Russian); English transi.: Amer. Math. Soc, Providence, R.I., 1990
4. L. de Branges,Hubert Spaces of Entire Functions, Prentice-Hall, Engelwood Cliffs, 1968.
5. R. Courant and A. Hurwitz,Funktionentheorie, Springer-Verlag, Berlin, Gottingen, Heidelberg, New York, 1964.