Chokphoemphun, et.al, Suriya, Sanhawat Thongdaeng, and Pongjet Promvonge. 2015. “Heat transfer and fluid flow behavior of air in square duct heat exchanger inserted with v-downstream winglet turbulators”. Asia-Pacific Journal of Science and Technology 20 (4):393-404. https://doi.org/10.14456/kkurj.2015.33.