Zhang, H. Z., X. G. Lin, P. Hua, M. Wang, X. Ao, L. H. Xiong, C. Wu, and J. J. Guo. 2010. “The Study of the Tumor Stem Cell Properties of CD133+CD44+ Cells in the Human Lung Adenocarcinoma Cell Line A549”. Cellular and Molecular Biology 56 (3):1350-58. https://mail.cellmolbiol.org/index.php/CMB/article/view/981.