“…They obtained several theorems such as Korovkin type approximation, local approximation, Lipschitz type convergence, Voronovskaja and Grüss-Voronovskaja type for the operators (4). We can mention some recent works based on shape parameter λ ∈ [−1, 1], see: [8,9,6,7,29,30,20,21,3,28,18,22,23,24,25].…”