1. Applications of q Calculus in Operator Theory;Aral,2013
2. Constructive Approximation;DeVore,1993
3. Some results on modified Szász–Mirakyan operators;Finta;J. Math. Anal. Appl.,2007
4. Theorems of the type of P.P. Korovkin type theorems;Gadzhiev;Engl. Transl. Math. Notes,1976
5. Certain new classes of Durrmeyer type operators;Govil;Appl. Math. Comput.,2013