Screening and identification of oval cells-like stem cells of Thy-1-labeled positive hepatoma carcinoma cells: Are they tumor stem cells?  
Cheng Bian-qiao, Jiang Yi
Chinese Journal of Tissue Engineering Research . 2010, (10): 1795 -1798 .  DOI: 10.3969/j.issn.1673-8225.2010.10.017