Lone, Mohamd Saleem. “Geometric Invariants of Normal Curves under Conformal Transformation in $\mathbb{E}^3$”. Tamkang Journal of Mathematics 53, no. 1 (January 18, 2022): 75–87. Accessed July 6, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3611.