Panwar, Yashwant K., and V. K. Gupta. “Common Factors of Pell and Pell-Lucas Numbers”. Progress in Applied Science and Technology 11, no. 1 (February 2, 2021): 7–9. Accessed April 28, 2024. https://ph02.tci-thaijo.org/index.php/past/article/view/243399.