Seckbach, J. and Chela-Flores, J. (2007). Extremophiles and Chemotrophs as Contributors to Astrobiological Signatures on Europa: A Review of Biomarkers of Sulfate-Reducers and Other Microorganisms, in "Instruments, Methods, and Missions for Astrobiology X", edited by Richard B. Hoover, Gilbert V. Levin, Alexei Y. Rozanov, Paul C. W. Davies Proc. of SPIE Vol. 6694, 66940W.