1. P. Bundschuh: A criterion for algebraic independence with some applications, Osaka J. Math. 25 (1988), 849–858
2. P.L. Cijsouw und R. Tijdeman: On the transcendence of certain power series of algebraic numbers, Acta Arith. 23 (1973), 301–305
3. N.I. Fel’dman: Estimate for a linear form of logarithms of algebraic numbers, Engl. transi.: Math. USSR Sb. 5 (1968), 291–307
4. J.M. Geijsel: Transcendence in fields of positive characteristic, Academisch Proefschrift, Amsterdam, 1978
5. K. Mahler: Arithmetic properties of lacunary power series with integral coefficients, J. Austr. Math. Soc. 5 (1965), 56–64