Hussein, A. M., K. O. Abdullah, K. A. Faraj, and D. F. Hamamin. “Radon Concentration in the Work Atmosphere of Cement Plants in the Sulaymaniyah Area, Iraq”. ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, Vol. 6, no. 1, Mar. 2018, pp. 7-12, doi:10.14500/aro.10329.