Tripiawan, W., and W.F. Frestikawati. “Risk Management: Identification and Mitigation in Maintenance Project During COVID-19 Outbreak (A Case Study in Telco Maintenance Project)”. Journal of Modern Manufacturing Systems and Technology, vol. 5, no. 2, Aug. 2021, pp. 52-58, doi:10.15282/jmmst.v5i2.6852.