Nguyen, Bao, Tuan Dao, and Tue Nguyen. “Feasibility Study of the Replacement of Refrigerants R22 & R12 by Using Environmentally Friendly Refrigerants R404A, R290 & R600A”. Science and Technology Development Journal 16, no. 4 (December 31, 2013): 60-67. Accessed May 8, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1585.