Nur, M. A., and H. Hadiyanto. “Enhancement of Chlorella Vulgaris Biomass Cultivated in POME Medium As Biofuel Feedstock under Mixotrophic Conditions”. Journal of Engineering and Technological Sciences, vol. 47, no. 5, Oct. 2015, pp. 487-9, doi:10.5614/j.eng.technol.sci.2015.47.5.2.