N. E. H. S. Ismaiel, W. M. Sharaf, D. O. Helmy, M. M. Zaki, M. A. E.-M. Badawi, and A. S. A. Soliman, “Detection of Cancer Stem Cells in Colorectal Cancer: Histopathological and Immunohistochemical Study”, Open Access Maced J Med Sci, vol. 4, no. 4, pp. 543–547, Dec. 2016.