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\bibitem{Tsuji_etal1999} {\textquotedblleft}\textit{Enhancement of X-ray fluorescence intensity from an ultra-thin sandwiched layer at grazing-emission angles}{\textquotedblright}. Tsuji K, Takenaka H, Wagatsuma K, de Bokx PK, Van Grieken RE, Spectrochimica acta: part B : atomic spectroscopy \textbf{54}, 1881 (1999).   http://doi.org/10.1016/S0584-8547(99)00143-3

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