Kahlig, Peter, and Jens Schwaiger. “Transforming the Functional Equation of Gołąb-Schinzel into One of Cauchy”. Annales Mathematicae Silesianae 8 (September 30, 1994): 33-38. Accessed November 21, 2024. https://journals.us.edu.pl/index.php/AMSIL/article/view/14215.