Kumar, Brijesh, Punit Paurush, Sanjay K. Sharma, and Gauri S. Prasad Singh. “Assessment of Coal Pillar Stability Using Principal Component Analysis and Stepwise Selection and Elimination”. Journal of Mines, Metals and Fuels 69, no. 3 (May 12, 2021): 81–87. Accessed May 16, 2024. http://www.informaticsjournals.com/index.php/jmmf/article/view/27783.