SHELKE MANGESH, TUWAR MEGHRAJ, SHINDE NIKHIL, BADAKH RAHUL, and Prof. THAKARE VISHAL. “Multiball Disc Variable Speed Drive”. International Journal of Advance Research in Engineering, Science & Technology, vol. 4, no. 3, Mar. 2017, pp. 325-30, https://ijarest.org/index.php/ijarest/article/view/923.