European Commission, “Radiation Protection 112-Radiological Protction Principles Concerning the Natural Radioactivity of Building Materials,” In: DirectorateGeneral: Environment, Nuclear Safety and Civil Protection, Office for Official Publications of the European Communities, 1999.
 F. Otoo, O. K. Adukpo, E. O. Darko, G. Emi-Reynolds, A. R. Awudu, H. Ahiamadjie, J. B. Tandoh, F. Hasford, S. Adu and O. Gyampo, “Assessment of Natural Radioactive Materials in Building Materials Used along the Coast of Central Region of Ghana,” Research Journal of Environmental and Earth Sciences, Vol. 3, No. 3, 2011, pp. 261-268.
 J. Beretka and P. J. Matthew, “Natural Radioactivity of Australian Building Materials, Industrial Wastes and By-Products,” Health Physics, Vol. 48, No. 11, 1985, pp. 87-95. doi:10.1097/00004032-198501000-00007
 R. Ratnayake, C. S. Hewamanna, P. Sumithrarachchi, H. L. C. Mahawatte and H. C. Nanayakkara, “Natural Radioactivity and Gamma Dose from Sri Lankan Clay Bricks Used in Building Construction,” Applied Radiation and Isotopes, Vol. 54, No. 2, 2001, pp. 365-369. doi:10.1016/S0969-8043(00)00107-X
 S. Solak, S. Turhan, F. A. Ugur, E. Goren, F. Gezer, Z. Yeugingil and I. Yeugingil, “Evaluation of Potential Exposure Risks of Natural Radioactivity Levels Emitted from Building Materials Used in Adana, Turkey,” Indoor and Built Environment, 2012, pp. 1-9.
 M. Ngachin, M. Garavaglia, C. Giovani, M. G. KwatoNjock and A. Nourreddine, “Assessment of Natural Radioactivity and Associated Radiation Hazards in Some Cameroonian Building Materials,” Radiation Measurements, Vol. 42, No. 11, 2007, pp. 61-67. doi:10.1016/j.radmeas.2006.07.007
 S. Dziri, A. Nourreddine, A. Sellam, A. Pape and E. Baussan, “Simulation Approach to Coincidence Summing in Spectrometry,” Applied Radiation and Isotopes, Vol. 70, No. 17, 2012, pp. 1141-1144. doi:10.1016/j.apradiso.2011.09.014
 A. Nachab, A. Nourreddine, M. Benjelloun, S. Kihel, D. Oster and A. Pape, “Uranium Analysis of Sediments by γ-Ray Spectrometry with Corrections for Self-Absorption,” Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 215, No. 1-2, 2004, pp. 228-234. doi:10.1016/S0168-583X(03)01814-7
 M. Ngachin, M. Garavaglia, C. Giovani, M. G. KwatoNjock and A. Nourreddine, “Radioactivity Level and Soil Radon Measurement of a Volcanic Area in Cameroon,” Journal of Environmental Radioactivity, Vol. 99, No. 17, 2008, pp. 1056-1060. doi:10.1016/j.jenvrad.2007.12.022