ANASTASSIOU, George A.; KESTER, Merve. Global smoothness preservation and simultaneous approximation by multivariate discrete operators: Dedicated to Professor Gheorghe Coman on the occasion of his 80th anniversary. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 61, n. 3, p. 257–278, 2016. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5566. Acesso em: 14 jul. 2025.