Kim H, Choi GH, Na DC, Ahn EY, Kim GI, Lee JE, Cho JY, Yoo JE, Choi JS, Park YN. Human hepatocellular carcinomas with \"Stemness\"-related marker expression: keratin 19 expression and a poor prognosis. Hepatology. 2011 Nov;54(5):1707–17. doi: 10.1002/hep.24559. PMID: 22045674.