GONSKA, Heiner, Margareta HEILMANN, and Ioan RAȘA. 2016. “Eigenstructure of the Genuine Beta Operators of Lupaș and Mühlbach: Dedicated to Professor Gheorghe Coman on the Occasion of His 80th Anniversary”. Studia Universitatis Babeș-Bolyai Mathematica 61 (3):383-88. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5604.