“Response Surface Methodology (RSM) A Good Optimizer for Transesterification Reaction of Chrysophyllum Albidium Seed Oil to Chrysophyllum Albidium Oil Biodiesel”, 65, vol. 1, no. 4, pp. 32–42, Apr. 2014, doi: 10.18488/journal.65/2014.1.4/65.4.32.42.