C. Riveros, Carlos M. “A Special Class of Hypersurfaces Parametrized by Lines of Curvature in R4”. Selecciones Matemáticas 5, no. 01 (July 27, 2018): 48 - 57. Accessed May 5, 2024. https://revistas.unitru.edu.pe/index.php/SSMM/article/view/1977.