Purohit, Vijay M., and Milind S. Marathe. “DESIGN SIMULATION & IMPLEMENTATION OF FOUR QUADRANT OPERATION OF DC DRIVE”. International Journal of Students’ Research in Technology & Management 1, no. 5 (September 26, 2015): 585-590. Accessed November 3, 2019. http://www.giapjournals.com/index.php/ijsrtm/article/view/100.