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\bibitem{Vanderborght+VanGrieken1978} {\textquotedblleft}\textit{Automated evaluation of photographically recorded spark-source mass spectra}{\textquotedblright}. Vanderborght B, Van Grieken R, Analytica chimica acta \textbf{103}, 223 (1978).   http://doi.org/10.1016/S0003-2670(01)84041-1

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