1. Anderson L. A., Gautschi W. Optimal weighted Chebyshev-type quadrature formulas. Calcolo, 12: 211–248, 1975.
2. Bernstein S. N. Sur les formules de quadrature de Cotes et Tchebycheff. C.R. Acad. Sci. URSS (Dokl. Akad. Nauk SSSR), N.S., 14: 323–327, 1937.
3. Bernstein S. N. On quadrature formulas with positive coefficients (Russian). Izv. Akad. Nauk SSSR, Ser. Mat. 1, No. 4:479–503, 1937. See also the announcements in C.R. Acad. Sci. Paris, 204:1294–1296 and 1526–1529, 1937.
4. Bernstein S. N. Sur un système d’équations indéterminées. J. Math. Pures Appl., (9) 17: 179–186, 1938.
5. Delsarte P., Goethals J. M., Seidel J. J. Spherical codes and designs. Geom. Dedicata, 6: 363–388, 1977.