Suvarnamani, A., Singta, A., & Chotchaisthit, S. (2011). On two diophantine equations 4x + 7y = z2 and 4x + 11y = z2. Progress in Applied Science and Technology, 1(1), 25–28. Retrieved from https://ph02.tci-thaijo.org/index.php/past/article/view/243265