AUTHOR=Teske Andreas , Biddle Jennifer F., Edgcomb Virginia P., Schippers Axel TITLE=Deep subsurface microbiology: a guide to the research topic papers JOURNAL=Frontiers in Microbiology VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2013.00122 DOI=10.3389/fmicb.2013.00122 ISSN=1664-302X