Miss. Kachare Savita, et al. “A COMPARATIVE STUDY OF DESIGN OF SIMPLE SPUR GEAR TRAIN AND HELICAL GEAR TRAIN WITH A IDLER GEAR BY AGMA METHOD ”. International Journal of Innovations in Engineering Research and Technology, Mar. 2021, pp. 1-8, https://repo.ijiert.org/index.php/ijiert/article/view/654.