1. S. Lang, Algebra (Addison–Wesley, Reading, Mass., 1965).
2. A. O. Gel’fond, Transcendental and Algebraic Numbers (Gostekhizdat, Moscow, 1952) [in Russian].
3. A. È. Eremenko, “Meromorphic solutions of algebraic differential equations,” Russian Math. Surveys 37 (4), 61–95 (1982).
4. N. I. Akhiezer, Elements of the Theory of Elliptic Functions (Nauka, Moscow, 1970).