Published online (and openly accessible) in the Early Edition of the http://www.pnas.org/:
H. C. Tung, N. E. Bramall, and P. B. Price
Microbial origin of excess methane in glacial ice and implications for life on Mars
PNAS published December 7, 2005, 10.1073/pnas.0507601102 (Environmental Sciences-Physical Sciences , Geophysics)
http://www.pnas.org/cgi/reprint/0507601102v1
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