Páles, Zsolt, and Amr Zakaria. “An Extension of the Abel–Liouville Identity”. Annales Mathematicae Silesianae 36, no. 2 (April 18, 2022): 206–214. Accessed April 11, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/13550.