Azmi MS, Lin TS, Tajarudin HA, Mohd Zaini Makhtar M, Daud Z. Characterisation of Calcium Carbonate Formed by Bacillus sphaericus Using Urea. IJIE. 2019;10(9). Accessed April 8, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/2394