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Overcoming low Ge ionization and erosion rate variation for quantitative ultralow energy secondary ion mass spectrometry depth profiles of Si1–xGex/Ge quantum well structures
Morris, R. J. H. (Richard J. H.).  Analytical Chemistry.  v. Vol.84. no. No.5.   2012-03-06. p. 2292 - 2298... issn: 0003-2700 .   

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