The uniform weighted approximation errors of Baskakov-type operators are characterized for weights of the form for γ0,γ∞∊[−1,0]. Direct and strong converse theorems are proved in terms of the weighted K-functional.
 Agrawal, P. N., Thamer, K. J.1998Approximation of unbounded functions by a new sequence of linear positive operatorsJ. Math. Anal. Appl.225600–672.