1. F. B. Hildebrand, op. cit., p. 287-288.
2. International Series in Pure and Applied Mathematics;Hamming, R. W.,1962
3. NBS Applied Mathematics Series, No. 9, Tables of Chebyshev Polynomials 𝑆_{𝑛}(𝛼) and 𝐶_{𝑛}(𝛼), U. S. Govt. Printing Office, Washington, D. C., 1952; Introduction.