LOKU, Valdete; BRAHA , Naim L. Λ²-statistical convergence and its application to Korovkin second theorem. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 64, n. 4, p. 537–549, 2019. DOI: 10.24193/subbmath.2019.4.08. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2379. Acesso em: 5 feb. 2025.