1. A. M. Acu, F. Sofonea, I. Rasa, Composition of some positive linear integral operators, (submitted).
2. A. M. Acu, I. Raşa, Andra Seserman, Composition and decomposition of positive linear operators, (VIII), Axioms 2023, 12, 228.
3. Z. Ditzian, V. Totik, Moduli of Smoothness, Springer, New York, 1987.
4. R. K. S. Rathore, Linear combinations of linear positive operators and generating relations on special functions, Ph. D. Thesis, Delhi, 1973.
5. F. Sofonea, On a sequence of linear and positive operators, General Mathematics, vol. 16, no. 4, 2008, 155-165.