M. Manikandan, S. Mahendiran and A.P. Surya Chandran 2018. Reduction of unforged bar bulb in engine valve manufacturing. International Journal of Intellectual Advancements and Research in Engineering Computations. 6, 1 (Mar. 2018), 475–480. DOI:https://doi.org/10.61096/ijiarec.v6.iss1.2018.475-480.