Sahin, Bayram, and Rifat Gunes. “Integrability of Distributions in CR-Lightlike Submanifolds”. Tamkang Journal of Mathematics 33, no. 3 (September 30, 2002): 209-222. Accessed May 29, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/323.