Panggabean, Poster Harmoko, and Syafiatun Siregar. “Analisis Binary Circle in Geothermal Power Plant Dengan Pemasangan Preheater Sarulla Operations. Ltd”. Jurnal Insinyur Profesional 2, no. 1 (December 7, 2022). Accessed July 4, 2025. https://jurnal.unimed.ac.id/2012/index.php/jip/article/view/26869.