Pervaiz, S. ., F. Z. . Khan, and K. . Javid. “3D Analysis of Graveyard Trees in the Wake of COVID-19: 3D Analysis of Graveyard Trees in the Wake of COVID-19”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 57, no. 4, Aug. 2021, pp. 113–127, https://ppaspk.org/index.php/PPAS-A/article/view/447.