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Kawamura et al 2001. Using culturing and a bit of taxa-specific PCR to assay microbes on Mir. Cite in intro. 10.1111/j.1348-0421.2001.tb01321.x/pdf  Pierson 2001. "Microbial contamination in spacecraft" is a review on what was known to date and how that information was used in designing the ISS. Cite in intro.   Bernardini 2005. Microbial survey of ISS cooling system. Can't find the paper, need to dig it up and see if it's worthwhile. Conference proceedings.  Moissel 2007. Used 16S surveys (full-length primers followed by TOPO cloning) to examine the earthbound ISS simulator which attempts to replicate the conditions on the ISS as much as possible. Cite in intro? http://dx.doi.org/10.1017/S1473550406003533