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Kuhnert, Peter; Frey, Joachim; Lang, Niklaus P.; Mayfield, Lisa (2002). Phylogenetic analysis of Prevotella nigrescens, Prevotella intermedia and Porphyromonas gingivalis clinical strains reveals a clear species clustering. International journal of systematic and evolutionary microbiology, 52(4), pp. 1391-1395. Reading, UK: Society for General Microbiology SGM 10.1099/ijs.0.02021-0
