E. E. Saleh, A. A. AlNagashee, H. I. El Kassas, S. A. . ElFiki, and H. A. Diab, “Evaluation of environmental hazards resulted from natural radioactivity in rocks from catchment area in Delta Tuban in Yemen”, Univ. Aden J. Nat. and Appl. Sc., vol. 20, no. 2, pp. 333–345, Aug. 2016.