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Kishimoto N, Kosako Y, Tano T. (1991). "Acidobacterium capsulatum gen. nov., sp. nov.: An acidophilic chemoorganotrophic bacterium containing menaquinone from acidic mineral environment". Curr. Microbiol. 22: 1–7. doi:10.1007/BF02106205. S2CID20636659.