1. Akhiezer N.I.: Orthogonal polynomials on several intervals. Soviet Math. Dokl. 1, 989–992 (1960)
2. Akhiezer N.I., Tomchuk Yu. Ya.: On the theory of orthogonal polynomials over several intervals (in Russian). Dokl. Akad. Nauk SSSR 138, 743–746 (1961)
3. Aptekarev A.I.: Asymptotic properties of polynomials orthogonal on a system of contours and periodic motions of Toda chains. Mat. Sb. 125, 231–258 (1984)
4. Davis, P.J.: The Schwarz function and its applications. The Carus Mathematical Monographs Vol. 17. Washington, DC: The Mathematical Association of America, 1974
5. Kaliaguine V.A.: On asymptotics of L p extremal polynomials on a complex curve (0 < p < ∞). J. Approx. Theory 74, 226–236 (1993)