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D.D. Wynn-Williams,
H.G.M. Edwards,
E.M. Newton
and J.M. Holder
(2002).
Pigmentation as a survival strategy for ancient and modern photosynthetic microbes under high ultraviolet stress on planetary surfaces. International Journal of Astrobiology,
1
,
pp 39-49
doi:10.1017/S1473550402001039