BEKAR, M.; HATHOUT , F.; YAYLI , Y. Legendre curves and the singularities of ruled surfaces obtained by using rotation minimizing frame. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 5, p. 589–601, 2021. DOI: 10.37863/umzh.v73i5.895. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/895. Acesso em: 7 apr. 2025.