Two-sided estimates of solutions of operator equations
English version (Springer): Ukrainian Mathematical Journal 41 (1989), no. 9, pp 1033-1037.
Citation Example: Dement'ev S. N., Yanovskii L. P. Two-sided estimates of solutions of operator equations // Ukr. Mat. Zh. - 1989. - 41, № 9. - pp. 1198–1204.
Full text