1. Approximation by a generalization of the Jakimovski-Leviatan operators
2. A. Jakimovski and D. Leviatan, “Generalized Szász operators for the approximation in the infinite interval,” Mathematica (Cluj) 11, 97–103 (1969).
3. Approximation by Chlodowsky type Jakimovski–Leviatan operators
4. I. Chlodovsky, “Sur le développement des fonctions définies dans un intervalle infini en séries de polynomes de ms bernstein,” Compositio Mathematica 4, 380–393 (1937).
5. A. Wafi and S. Khatoon, “The Voronovskaya theorem for generalized Baskakov–Kantorovich operators in polynomial weight spaces.” Matematichki Vesnik 57, 87–94 (2005).