1. F.G. Avkhadiev, “Conformally Invariant Inequalities and their Applications,” Preprint No. 95-1 (Kazan Found. “Mathem.”, 1995).
2. F. G. Avkhadiev and K.-J. Wirths, “The Conformal Radius as a Function and its Gradient Image,” Israel Journal of Mathematics 145, 349–374 (2005).
3. G. M. Goluzin, Geometric Theory of Functions of Complex Variable (Nauka, Moscow, 1966) [in Russian].
4. A. A. Savelov, Plane Curves (Fizmatgiz, Moscow, 1960) [in Russian].
5. L. Alfors, Lectures on Quasiconformal Mappings (Princeton, New Jersey, 1966; Mir, Moscow, 1969).