TACHEV, Gancho. On two modified Phillips operators: Dedicated to Professor Heiner Gonska on the occasion of his 70th anniversary. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 64, n. 3, p. 305–312, 2019. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2295. Acesso em: 5 feb. 2025.