Global approximation by modified Baskakov type operators. Vijay Gupta (1995) Publicacions Matemàtiques In the present paper, we prove a global direct theorem for the modified Baskakov type operators in terms of so called Ditzian-Totik modulus of smoothness.
Grüss-type inequalities for positive linear operators with second order moduli Heiner Gonska, Gancho Tachev (2011) Matematički Vesnik