T. Venkateshan, M. Manoj, S. Pravin Kumar and R. Prakashbabu (2019) “Fabrication of button operated electro-magnetic gear shifting system and increasing the efficiency of IC engine by using hydrogen fuel”, International journal of intellectual advancements and research in engineering computations, 7(2), pp. 2728–2732. doi: 10.61096/ijiarec.v7.iss2.2019.2728-2732.