P., S., and R. Shunmugam. “A Direct Buck-Boost Converter Based on Flyback Topology for Photovoltaic Application Without Using Centre Tapped Transformer”. The International Journal of Science & Technoledge, vol. 3, no. 4, Apr. 2015, http://internationaljournalcorner.com/index.php/theijst/article/view/124364.