BAKY, R. A. A. On the Blaschke approach of ruled surface. Tamkang Journal of Mathematics, [S. l.], v. 34, n. 2, p. 107–116, 2003. DOI: 10.5556/j.tkjm.34.2003.257. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/257. Acesso em: 27 apr. 2024.