A. Altin, “On the energy and pseudo-angle of Frenet vector fields in $R^n_v$”, Ukr. Mat. Zhurn., vol. 63, no. 6, pp. 833–839, Jun. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2766