“DETERMINATION OF WORK INDEX OF GRAPHITE FROM SAMAN-BURKONO (NIGERIA) USING MODIFIED BOND’S METHOD”, NIJOTECH, vol. 38, no. 3, pp. 609–613, Jun. 2019, Accessed: Apr. 16, 2026. [Online]. Available: https://www.nijotech.com/index.php/nijotech/article/view/2049