Wang, J., M. G. Cao, C. Z. You, C. L. Wang, S. L. Liu, C. Kai, and J. Dou. “A Preliminary Investigation of the Relationship Between Circulating Tumor Cells and Cancer Stem Cells in Patients With Breast Cancer”. Cellular and Molecular Biology, vol. 58, no. 2, Feb. 2012, pp. 1641-45, https://cellmolbiol.org/index.php/CMB/article/view/546.