Rohit, A. K., and A. Lanjewar. “Performance Evaluation of Solar Air Heater by Using W- Discrete Rib Pattern”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 16, no. 1, Feb. 2016, pp. 90-97, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1335.