Ahsan, Zafar, Bilal ., and Musavvir Ali. “Petrov Type D Spacetimes and Lanczos Potential”. Journal of the Tensor Society 11, no. 01 (December 30, 2017): 97-105. Accessed September 25, 2025. https://tensorsociety.com/journal/index.php/JTS/article/view/88.