Juki, Mohd Irwan, et al. “Effect of Enterococcus Faecalis Bacteria and Calcium Lactate on Concrete Properties and Self-Healing Capability”. International Journal of Sustainable Construction Engineering and Technology, vol. 10, no. 1, Aug. 2019, https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/3442.