Al-Mugren, K. “Indoor Radon Concentrations and Effective Dose Rates Estimation in Workplaces at Princess Nourah Bint AbdulRahman University”. Journal of Qassim University for Science, vol. 8, no. 2, July 2015, pp. 167-81, https://jnsm.qu.edu.sa/index.php/jnm/article/view/1778.