1. V. N. Dubinin, “On a method of symmetrization,”Nauchn. Trudy Kuban. Univ.,180, 50–64 (1974).
2. Shah Tao Shing, “Some covering properties of convex domains in the theory of conformal mapping,”Scientia Sinica,7, 816–828 (1958).
3. H. Grötzsch, “Über die Verzerrung bei schlichter konformer Abbildung mehrfach zusammenhängender schlichter Bereiche,”Ber. Verh. Sächs. Akad. Wiss. Leipzig, Math.-Phys. Kl.,81, 38–50 (1929).
4. A. Mori, “On an absolute constant in the theory of quasiconformal mappings,”J. Math. Jpn.,8, 156–166 (1956).
5. A. Yu. Solynin, “Harmonic measure of continua with fixed diameter,”Zap. Nauchn. Semin. LOMI,144, 146–149 (1985).