Thamrin, Ismail, and Novaldo K. “Shape and Long Pipe Spiral Effect for the Temperature and Efficiency in Mini Boiler”. Journal of Mechanical Science and Engineering 3, no. 2 (June 29, 2020): 019–022. Accessed September 19, 2024. https://jmse.ejournal.unsri.ac.id/index.php/jmse/article/view/23.