Focaroli, S., V. Salvatore, G. Teti, L. Ingrà, and M. Falconi. “A Synergic Effect of Alginate and Hypoxia-Inducing Ions on Chondrogenic Differentiation in Adipose Derived Mesenchymal Stem Cells”. Italian Journal of Anatomy and Embryology, vol. 120, no. 1, Sept. 2015, p. 107, https://oajournals.fupress.net/index.php/ijae/article/view/4061.