A. A. Hamid, Izni, et al. “Solubility Modelling Pf Butterfly Wing Leaves (Christia Vespertilionis) in Supercritical Carbon Dioxide”. International Journal of Engineering & Technology, vol. 7, no. 3.26, Aug. 2018, pp. 9-12, https://doi.org/10.14419/ijet.v7i3.26.17451.