C. K. Chui, X. Li, J. D. Ward, “On the convergence rate ofs-numbers of compact Hankel operators”, Circuits Systems and Signal Process, 11:2 (1992), 353
Peetre J. Karlsson J., “Rational Approximation-Analysis of the Work of Pekarskii”, Rocky Mt. J. Math., 19:1 (1989), 313–333
Devore R. Popov V., “Interpolation Spaces and Non-Linear Approximation”, Lect. Notes Math., 1302 (1988), 191–205
Peller V., “Smoothness of Schmidt Functions of Smooth Hankel-Operators”, Lect. Notes Math., 1302 (1988), 337–346
Alphonse P. Magnus, Nonlinear Numerical Methods and Rational Approximation, 1988, 105
Richard Rochberg, Stephen Semmes, Contributions to Operator Theory and its Applications, 1988, 217
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
Pekarskii A., “Direct and Converse Theorems of Rational Approximation in the Spaces Lp[-1,1] and C[-1,1]”, 293, no. 6, 1987, 1307–1310
Volberg A., Ivanov O., “Belonging of the Product of 2 Hankel-Operators to the Schatten-Vonneumann Class”, no. 4, 1987, 3–6
А. А. Пекарский, “Классы аналитических функций, определяемые наилучшими рациональными приближениями в $H_p$”, Матем. сб., 127(169):1(5) (1985), 3–20 ; A. A. Pekarskii, “Classes of analytic functions determined by best rational approximations in $H_p$”, Math. USSR-Sb., 55:1 (1986), 1–18