J. S. . Chiuyo, P. K. . Msaki, and I. N. . Makundi, “Radiation Dose to the Contralateral Breast and Effectiveness of Superflab in Dose Reduction during Treatment of Breast Cancer by Cobalt-60 External Beam”, Tanz. J. Sci., vol. 46, no. 3, pp. 873–885, Oct. 2020.