Saeed, T. M. A., and J. A. Jalal. “Immunohistochemical Expression of p53 and p21 in Gliomas: A Clinicopathological Study”. Zanco Journal of Medical Sciences (Zanco J Med Sci), vol. 17, no. 2, Aug. 2013, pp. 435-42, doi:10.15218/zjms.2013.0029.