K. G. Ivanov

Nongeometric convergence of best _{}(≠2) polynomial approximants

E. Saff, E. B. Saff, K. G. Ivanov, 1990 .

Fast decreasing polynomials

Vilmos Totik, K. G. Ivanov, 1990 .

Minimal number of significant directional moduli of smoothness

Z. Ditzian, Z. Ditzian, K. G. Ivanov, 1993 .

On Convex Approximation by Quadratic Splines

K. G. Ivanov, Boyan Popov, 1996 .