Towoju, O. A., Dare, A. A., & Fashogbon, S. K. (2018). Experimental investigation of the performance and emission characteristics of a CI engine equipped with a modified truncated cone piston crown operated on diesel and shea-butter biodiesel. European Journal of Engineering and Technology Research, 3(10), 126–131. https://doi.org/10.24018/ejeng.2018.3.10.954