Zariatin, D. L., Rahmalina, D., Prasetyo, E., Suwandi, A. and Sumardi, M. (2019) “The effect of surface roughness of the impeller to the performance of pump as turbine pico power plant”, Journal of Mechanical Engineering and Sciences, 13(1), pp. 4693–4703. doi: 10.15282/jmes.13.1.2019.24.0394.