1. Introduction to the theory of linear non-selfadjoint operators in Hilbert space;Gohberg,1965-1969
2. ε-entropy and e-capacity of sets in function spaces;Kolmogorov;Uspehi Mat. Nauk.,1959
3. Metric entropy and approximation;Lorentz;Bull. Amer. Math. Soc.,1966
4. Operator ideals;Pietsch,1978
5. On the order of growth of the s-entropy of spaces of real continuous functionals defined on a connected compactum;Timan;Uspehi Mat. Nauk.,1964