Suryo Hartanto, Yanti Riani, Nina Agustyaningrum, Yesi Gusmania. “Industrial Competency Based-Mathematics Instructional Materials for Mechanical Engineering in VHS”. Annals of the Romanian Society for Cell Biology, Mar. 2021, pp. 4610-9, https://annalsofrscb.ro/index.php/journal/article/view/1966.