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\bibitem{Holynska_etal1998} {\textquotedblleft}\textit{Performance of total reflection and grazing emission X-ray fluorescence spectrometry for the determination of trace metals in drinking water in relation to other analytical techniques}{\textquotedblright}. Ho{\l}ynska B, Olko M, Ostachowicz B, Ostachowicz J, Wegrzynek D, Claes M, Van Grieken R, de Bokx P, Kump P, Necemer M, Fresenius{\textquoteright} journal of analytical chemistry \textbf{362}, 294 (1998).   http://doi.org/10.1007/S002160051077

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