1. I. P. Natanson, Constructive Function Theory (GITTL, Moscow, 1949) [in Russian].
2. V. K. Ivanov, Mat. Sb. 28(70), 685–706 (1951).
3. M. M. Lavrent’ev, On Certain Ill-Posed Problems in Mathematical Physics (Sib. Otd. Akad. Nauk SSSR, Novosibirsk, 1962) [in Russian].
4. J. P. Thiran and C. Detaille, in Progress in Approximation Theory (Boston (MA): Acad. Press, 1991), pp. 771–786.
5. G. M. Goluzin, Geometric Theory of Functions of a Complex Variable (Nauka, Moscow, 1966; Am. Math. Soc., Providence, R.I., 1969).