Chaulya, S. K., G. M. Prasad, S. Ansari, R. Kumar, and D. Kumar. “Coal Production and Transportation Monitoring System for Opencast Mines”. Journal of Mines, Metals and Fuels, vol. 64, no. 9, Oct. 2022, pp. 437-45, https://informaticsjournals.com/index.php/jmmf/article/view/31585.