Dewantara, R., S. Iskandar, and A. Fatwanto. “Availability Analysis With Failover Computer Cluster Method Case Study in Academic Information System of UIN Sunan Kalijaga”. IJID (International Journal on Informatics for Development), vol. 6, no. 2, Nov. 2018, pp. 46-50, doi:10.14421/ijid.2017.06205.