Widjajati, Farida Agustini, et al. “Quality Control Analysis of The Water Meter Tools Using Decision-On-Belief Control Chart in PDAM Surya Sembada Surabaya”. (IJCSAM) International Journal of Computing Science and Applied Mathematics, vol. 2, no. 1, Mar. 2016, pp. 1-7, https://journal.its.ac.id/index.php/ijcsam/article/view/4558.