Kormin, Faridah, et al. “Statistical Mixture Design: Study of Solvent Performance in Temperature Controlled Microwave Assisted Extraction System on Antioxidant Properties of Nephrolepis Biserrata (Schott.) Sw. Frond Extract”. International Journal of Engineering & Technology, vol. 7, no. 3.7, July 2018, pp. 605-9, https://doi.org/10.14419/ijet.v7i3.7.19061.