[1] AGRAWAL P N,THAMER K J.Approximation of Unbounded Function by a New Sequence of Linear Positive Operators [J].J.Math. Anal. Appl.,1998,225:660-672.
[2] GUPTA V.Rate of Approximation by a New Sequence of Linear Positive Operators [J].Computers Math. Applic.,2003,45(12):1 895-1 904.
[3] AGRAWAL P N,MOHAMMAD A J.On Approximation by a Linear Combination of a New Sequence of Linear Positive Operators [J].Turk. J. Math.,2003,27:389-405.
[4] MICCHELLI C A.The Saturation Class and Iterates of the Bernstein Polynomial [J]. J. Approx. Theory,1973,8:1-18.
[5] TIMAN A F.Theory of Approximation of Functions of a Real Variable [M].New York:Dover Publications Inc.,1994.