TADEE, S. On the Diophantine Equation 1/w+1/x+1/y+1/z=u/u+1. Progress in Applied Science and Technology, Thailand, v. 15, n. 1, p. 1–5, 2025. DOI: 10.60101/past.2025.257129. Disponível em: https://ph02.tci-thaijo.org/index.php/past/article/view/257129. Acesso em: 12 oct. 2026.