HUTASUHUT, D. I. G.; OMMI ALFINA; NITA SYAHPUTRI; SIHOTANG, S. F.; EFANI DESI; SITI ALIYAH. Expert System Detects Boiler Engine Damage Using Certainty Factors. U-NET Jurnal Teknik Informatika, v. 5, n. 2, p. 52-59, 27 Feb. 2021.