Saff E. Stahl H., “Ray Sequences of Best Rational Approximants for [X](Alpha)”, Can. J. Math.-J. Can. Math., 49:5 (1997), 1034–1065
Biancamaria Della Vecchia, Giuseppe Mastroianni, “Rational approximation in uniform and weighted L1 norm”, Journal of Computational and Applied Mathematics, 53:3 (1994), 333
Stahl H., “Best Uniform Rational Approximation of X-Alpha on [0, 1]”, Bull. Amer. Math. Soc., 28:1 (1993), 116–122
Г. Шталь, “Наилучшие равномерные рациональные аппроксимации $|x|$ на $[-1,1]$”, Матем. сб., 183:8 (1992), 85–118 ; H. Stahl, “Best uniform rational approximation of $|x|$ on $[-1,1]$”, Russian Acad. Sci. Sb. Math., 76:2 (1993), 461–487
Alphonse P. Magnus, Nonlinear Numerical Methods and Rational Approximation, 1988, 105
J. Illán, Lecture Notes in Mathematics, 1354, Approximation and Optimization, 1988, 155
А. А. Пекарский, “Чебышевские рациональные приближения в круге, на окружности и на отрезке”, Матем. сб., 133(175):1(5) (1987), 86–102 ; A. A. Pekarskii, “Tchebycheff rational approximation in the disk, on the circle, and on a closed interval”, Math. USSR-Sb., 61:1 (1988), 87–102
А. А. Гончар, Е. А. Рахманов, “Равновесные распределения и скорость рациональной аппроксимации аналитических функций”, Матем. сб., 134(176):3(11) (1987), 306–352 ; A. A. Gonchar, E. A. Rakhmanov, “Equilibrium distributions and degree of rational approximation of analytic functions”, Math. USSR-Sb., 62:2 (1989), 305–348
Н. С. Вячеславов, “Об аппроксимации $x^\alpha$ рациональными функциями”, Изв. АН СССР. Сер. матем., 44:1 (1980), 92–109 ; N. S. Vyacheslavov, “On the approximation of $x^\alpha$ by rational functions”, Math. USSR-Izv., 16:1 (1981), 83–101
Ramazanov A., “Rings of the Coefficients of Rational Functions and Polynomials Best Approximating Functions Chi-Alpha”, Vestn. Mosk. Univ. Seriya 1 Mat. Mekhanika, 1980, no. 5, 41–44