MOUSA, I.; SALAMA, F. Differential equations and folding of $n$-mani-folds. Tamkang Journal of Mathematics, [S. l.], v. 36, n. 3, p. 261–274, 2005. DOI: 10.5556/j.tkjm.36.2005.119. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/119. Acesso em: 3 jul. 2024.