Yılmaz, Süha, and Yasin Unluturk. “On Spherical Indicatrices of Curves in Galilean 4-Space G₄”. Journal of the Indonesian Mathematical Society 25, no. 2 (July 15, 2019): 154–170. Accessed November 21, 2024. https://jims-a.org/index.php/jimsa/article/view/473.