A characterization of weighted approximations by the Post-Widder and the Gamma operators. - Borislav R. Draganov; Kamen G. Ivanov (J. Approx. Theory, 2007)

A characterization of weighted approximations by the Post-Widder and the Gamma operators, II. - Borislav R. Draganov; Kamen G. Ivanov (J. Approx. Theory, 2010)

Fast memory efficient evaluation of spherical polynomials at scattered points. - Kamen G. Ivanov; Pencho Petrushev (Adv. Comput. Math., 2015)

Highly effective stable evaluation of bandlimited functions on the sphere. - Kamen G. Ivanov; Pencho Petrushev (Numer. Algorithms, 2016)

In Memoriam: Blagovest Sendov February 8, 1932-January 19, 2020. - Kamen G. Ivanov; Pencho Petrushev (J. Approx. Theory, 2020)