Piriyarungrod, N., S. Eiamsa-ard, P. Promvonge, and C. Thianpong. 2018. “Swirl Flow and Heat Transfer in Tubes Fitted With Multiple Twisted Tapes”. Journal of Research and Applications in Mechanical Engineering 4 (1):3. https://ph01.tci-thaijo.org/index.php/jrame/article/view/138726.