Matkowski, Janusz, and Małgorzata Wróbel. “A Generalized a-Wright Convexity and Related Functional Equation”. Annales Mathematicae Silesianae 10 (September 30, 1996): 7–12. Accessed May 6, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14188.