O.R Omar, E., N. Haussein, and A. Ahmed. “The Role of Immunohistochemistry in the Workup of Malignant Neoplasms of Unknown Primary Origin at Khartoum Oncology Hospital”. Asian Pacific Journal of Cancer Care, Vol. 6, no. 4, Nov. 2021, pp. 441-7, doi:10.31557/apjcc.2021.6.4.441-447.