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Wu Y, Engen JR.Wu Y, et al. Among authors: engen jr.Analyst. 2004 Apr;129(4):290-6. doi: 10.1039/b316341e. Epub 2004 Feb 20.Analyst. 2004.PMID: 15042158Review.No abstract available.
Wu Y, Engen JR, Hobbins WB.Wu Y, et al. Among authors: engen jr.J Am Soc Mass Spectrom. 2006 Feb;17(2):163-7. doi: 10.1016/j.jasms.2005.10.009. Epub 2006 Jan 10.J Am Soc Mass Spectrom. 2006.PMID: 16406808Free article.