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Duda, V; Suzina, N; Polivtseva, V; Boronin, A (2012). "Ultramicrobacteria: Formation of the Concept and Contribution of Ultramicrobacteria to Biology". Microbiology81 (4): 379–390. PMID23156684. doi:10.1134/s0026261712040054.
Iizuka T, Yamanaka S, Nishiyama T, Hiraishi A (febreiro de 1998). "Isolation and phylogenetic analysis of aerobic copiotrophic ultramicrobacteria from urban soil". J. Gen. Appl. Microbiol.44 (1): 75–84. PMID12501296. doi:10.2323/jgam.44.75.
Sahin, Nurettin; Gonzalez, Juan M.; Iizuka, Takashi; Hill, Janet E. (1 de xuño de 2010). "Characterization of two aerobic ultramicrobacteria isolated from urban soil and a description of Oxalicibacterium solurbis sp. nov.". FEMS Microbiology Letters307 (1): 25–29. PMID20370834. doi:10.1111/j.1574-6968.2010.01954.x.