1. On the diameters of the Euclidean ball;Garnaev;Dokl. Akad. Nauk SSSR,1984
2. Produits tensoriels topologiques et espaces nucléaires;Grothendieck;Mem. Amer. Math. Soc.,1955
3. Optimale Approximation beschränkter Mengen in normierten Räumen;Helfrich;J. Approx. Theory,1971
4. Diagonal operators, approximation numbers, and Kolmogoroff diameters;Hutton;J. Approx. Theory,1976
5. Diameters of sets in normed linear spaces and the approximation of functions by trigonometric polynomials;Ismagilov;Uspekhi Mat. Nauk,1974