1. K. Yu. Osipenko, M. I. Stesin, “On widths of the Hardy class $H_n$ in the $n$-dimensional ball”, Russian Math. Surveys, 45:5 (1990), 235–236  mathnet  crossref  mathscinet  zmath  adsnasa  isi
  2. Yu. A. Farkov, “Widths of Hardy classes and Bergman classes on the ball in $\mathbb C^n$”, Russian Math. Surveys, 45:5 (1990), 229–231  mathnet  crossref  mathscinet  zmath  adsnasa  isi
  3. Nguyên Th{\d i} Thiêu Hoa, “Some extremal problems on classes of functions determined by linear differential operators”, Math. USSR-Sb., 68:1 (1991), 213–255  mathnet  crossref  mathscinet  zmath  isi
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