Tabrez, M., P. K. Sadhu, and A. Iqbal. “A Novel Three Phase to Seven Phase Conversion Technique Using Transformer Winding Connections”. Engineering, Technology & Applied Science Research 7, no. 5 (October 19, 2017): 1953–1961. Accessed January 24, 2022. https://etasr.com/index.php/ETASR/article/view/1190.