Kalyabin G. A., Lizorkin P. I. Spaces of functions of generalized smoothness // Mathematische Nachrichten, v. 133, 1987, p. 7–32.
Kalyabin G. A. Asymptotic formula for minimal eigenvalues of Hilbert type matrices // Proceedings of the Second ISAAC Congress, Kluwer Academic Publishers, DORDRECHT/BOSTON/LONDON, v. 2, 2000, p. 1155–1162.