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\bibitem{Baltas+Cevik2009} {\textquotedblleft}\textit{Variation of \textbf{K} X-ray fluorescence cross-sections of Cu, Y and Ba in YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ superconductor}{\textquotedblright}. Baltas H, {\v C}evik U, Solid state communications \textbf{149}, 231 (2009).   http://doi.org/10.1016/J.SSC.2008.11.010

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