Rizal, Rizal, et al. “Effect of Serial Passage on Growth Kinetics, Biological Properties, and Differentiation into Adipocytes of Human Wharton’s Jelly-Derived Mesenchymal Stem Cells”. Majalah Kedokteran Bandung, vol. 51, no. 3, Dec. 2019, pp. 127-33, doi:10.15395/mkb.v51n3.1767.