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Ion yields and erosion rates for Si1−xGex(0x1) ultralow energy O2+ secondary ion mass spectrometry in the energy range of 0.25–1 keV
Morris, R. J. H. (Richard J. H.).  Journal of Applied Physics.  v. Vol.105. no. No.11.   2009-06-01. p. 06 - issn: 0021-8979 .   

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