Munandar, M. H. . ., M. Masrizal, and Y. . . Prayoga. “Image Processing for Combat Charcoal Identification Based on Maturity Level”. Jurnal Mantik, vol. 5, no. 3, Oct. 2021, pp. 1598-03, http://ejournal.iocscience.org/index.php/mantik/article/view/1553.