Extremal rational functions on several arcs of the unit circle with zeros on these arcs
A. L. Lukashov, S. V. Tyshkevich

References
1.	Smirnov V. I., Lebedev N. A., Konstruktivnaya teoriya funktsii kompleksnogo peremennogo, Nauka, M., L., 1964
2.	Thiran J.-P., Detaille C., “Polynomials on Circular Arcs in the Complex Plane”, Progress in Approximation Theory, Academic Press, Boston; QA, 1991, 771–786
3.	Widom H., “Extremal polinomials associated with a system of curves in the complex plane”, Adv. Math., 3 (1969), 127–232
4.	Lukashov A. L., “Neravenstva dlya proizvodnykh ratsionalnykh funktsii”, Izv. RAN. Ser. matem., 68:3 (2004), 115–138
5.	Tyshkevich S. V., “O chebyshevskikh polinomakh na dugakh okruzhnosti”, Mat. zametki, 81:6 (2007), 952–954