Effect of platelet-derived growth factor beta on in vitro proliferation and differentiation of human periodontal ligament cells   
Lin Jing-guang, Qi Feng, Ge Yi-ming, Han Jie
Chinese Journal of Tissue Engineering Research . 2011, (2): 265 -268 .  DOI: 10.3969/j.issn.1673-8225.2011.02.018