1. A contribution to the theory of univalent and Bieberbach-Eilenberg functions;Alenicyn, Yu. E.;Dokl. Akad. Nauk SSSR (N.S.),1956
2. S. A. Gelfer, On the class of regular functions not taking on any pair of values 𝑤 and -𝑤, Mat. Sb. (N.S.) 19 (1946), 33-44. (Russian. English summary)
3. Almost bounded functions;Goodman, A. W.;Trans. Amer. Math. Soc.,1955
4. Principe de l’augmentation des longueurs extrémales;Hersch, Joseph;C. R. Acad. Sci. Paris,1953
5. Some results related to extremal length;Jenkins, James A.,1953