Thamrin I, K N. Shape and Long Pipe Spiral Effect for the Temperature and Efficiency in Mini Boiler. J. Mech. Sci. Eng. [Internet]. 2020 Jun. 29 [cited 2024 Nov. 21];3(2):019-22. Available from: https://jmse.ejournal.unsri.ac.id/index.php/jmse/article/view/23