GEORGIEV, S.; MORAIS, J.; SPROSS, W. New Aspects on Elementary Functions in the Context of Quaternionic Analysis. CUBO, A Mathematical Journal, [S. l.], v. 14, n. 1, p. 93–110, 2012. DOI: 10.4067/S0719-06462012000100008. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1356. Acesso em: 12 oct. 2025.