Tu, V., H. Le, X. To, P. Nguyen, P. Huynh, T. Le, and N. Vu. “Method for in Vitro Production of Cartilage Microtissues from Scaffold-Free Spheroids Composed of Human Adipose-Derived Stem Cells”. Biomedical Research and Therapy, Vol. 7, no. 4, Apr. 2020, pp. 3697-08, doi:10.15419/bmrat.v7i4.597.