H. P. Mammba, V. A. Balobegwa, A. P. Muhulo, P. A. Pantaleo, and R. A. Kawala, “Assessment of natural radioactivity and radiation hazards of building materials in Kinondoni District, Dar es Salaam, Tanzania”, Tanz. J. Sci., vol. 47, no. 2, pp. 664–673, May 2021.