HE, B.; TOGBÉ, A.; YANG, S. A note on the Diophantine equation $|a^x-b^y|=c$. MATHEMATICA SCANDINAVICA, [S. l.], v. 107, n. 2, p. 161–173, 2010. DOI: 10.7146/math.scand.a-15149. Disponível em: https://www.mscand.dk/article/view/15149. Acesso em: 28 mar. 2024.