ASYMPTOTIC ESTIMATES FOR THE APPROXIMATION AND ENTROPY NUMBERS OF A ONE-WEIGHT RIEMANN-LIOUVILLE OPERATOR [TRANSLATION OF MAT. TR. {BF 9} (2006), NO. 1, 52--100; MR2251331] Article Lomakina E.N., Stepanov V.D. Siberian Advances in Mathematics. Vol. 17. 2007. P. 1-36
