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Everett, K. D. E.; Bush, R. M.; Andersen, A. A. (1999). "Emended description of the order Chlamydiales, proposal of Parachlamydiaceae fam. nov. and Simkaniaceae fam. nov., each containing one monotypic genus, revised taxonomy of the family Chlamydiaceae, including a new genus and five new species, and standards for the identification of organisms". International Journal of Systematic Bacteriology. 49 (2): 415–440. doi:10.1099/00207713-49-2-415. ISSN0020-7713. PMID10319462.