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Greub G, Raoult D «Morphology of Legionella pneumophila according to their location within Hartmanella vermiformis». Res Microbiol., 154, 9, Nov 2003, pàg. 619–21. DOI: 10.1016/j.resmic.2003.08.003. PMID: 14596898.
Pan X, Lührmann A, Satoh A, Laskowski-Arce MA, Roy CR «Ankyrin repeat proteins comprise a diverse family of bacterial type IV effectors». Science, 320, 5883, Jun 2008, pàg. 1651–4. DOI: 10.1126/science.1158160. PMID: 18566289.
Rossier O, Cianciotto NP «Type II protein secretion is a subset of the PilD-dependent processes that facilitate intracellular infection by Legionella pneumophila». Infect Immun., 69, 4, Apr 2001, pàg. 2092–8. DOI: 10.1128/IAI.69.4.2092-2098.2001. PMC: 98134. PMID: 11254562.