HE, Bo; TOGBÉ, Alain; YANG, Shichun. A note on the Diophantine equation $|a^x-b^y|=c$. Mathematica Scandinavica, Berkeley, CA, United States, v. 107, n. 2, p. 161–173, 2010. DOI: 10.7146/math.scand.a-15149. Disponível em: https://journals.msp.org/mscand/article/view/548. Acesso em: 24 jul. 2026.