Team, S. “On the Extended Null Scrolls in Minkowski 3-Space: Mahmut Ergut, Handan Balgetir Oztekin, Alper Osman Ogrenmis”. Thai Journal of Mathematics, vol. 9, no. 1, Apr. 2011, pp. 29-37, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/245.