Joseph Henri Nainggolan, Maxwel, Wiwik Rahayu, and Puspita Lisdiyanti. “Effect of Urease Enzyme on Shear Strength of Clay Shale”. International Journal of Engineering and Technology 7, no. 4.36 (December 9, 2018): 424–428. Accessed May 18, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/23909.