1. Ahiezer, N.I.: Vorlesungen über Approximationstheorie. Berlin: Akademie-Verlag 1953
2. Andersson, J.-E.: On the degree of polynomial and rational approximation of holomorphic functions. Dissertation. University of Göteborg 1975
3. Andersson, J.-E.: On the degree of weighted polynomial approximation of holomorphic functions. Analysis math. (to appear)
4. Dynkin, E.M.: Uniform polynomial approximation in complex domains (Russian). Zapiski nau?n. Sem. Leningrad. Otd. mat. Inst. Steklov47, 164?165 (1974)
5. Lecture Notes in Mathematics;G. Fichera,1974