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		Siburian, Johan, 		Suprapta Winaya, I Nyoman, DAN 		Astawa, Ketut.
" Pengaruh Pemeliharaan Air Heater Terhadap Efisiensi Boiler PLTU Unit 4 UP Muara Karang" <em>Teknik Desain Mekanika</em> [Online], Volume 8 Nomor 4 (1 October 2019)