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 (Jun. 2019), 2728–2732. DOI:https://doi.org/10.61096/ijiarec.v7.iss2.2019.2728-2732.