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\bibitem{Celik_etal2009} {\textquotedblleft}\textit{Natural and artificial radioactivity measurements in Eastern Black Sea region of Turkey}{\textquotedblright}. Celik N, {\v C}evik U, Celik A, Koz B, Journal of hazardous materials \textbf{162}, 146 (2009).   http://doi.org/10.1016/J.JHAZMAT.2008.05.017

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