ALTIN, A. On the energy and pseudo-angle of Frenet vector fields in $R^n_v$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 6, p. 833–839, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2766. Acesso em: 5 dec. 2025.