Musyafa, Ali, Revina S. K. Pradana, Imam Abadi, and Bambang Lelono Widjiantoro. 2017. “HAZOP Study and Layer of Protection Analysis Based Fuzzy System at Oil Distribution Unit, Surabaya- East Java”. Asian Journal of Applied Sciences 5 (4). https://ajouronline.com/index.php/AJAS/article/view/4916.