Kristjánsson, J.K., Hjörleifsdóttir, S., Marteinsson, V.Th., Alfredsson, G.A. 1994. Thermus scotoductus, sp. nov., a pigment-producing thermophilic bacterium from hot tap water in Iceland and including Thermus sp. X-1. Systematic and Applied Microbiology. 17 : 44-50.