Woo, Patrick C. Y.; Huang, Yi; Lau, Susanna K. P.; Yuen, Kwok-Yung (24. august 2010). «Coronavirus Genomics and Bioinformatics Analysis». Viruses. 2 (8): 1804–1820. PMC3185738. PMID21994708. doi:10.3390/v2081803. «Figure 2. Phylogenetic analysis of RNA-dependent RNA polymerases (Pol) of coronaviruses with complete genome sequences available. The tree was constructed by the neighbor-joining method and rooted using Breda virus polyprotein.»
ictvonline.org
talk.ictvonline.org
«Virus Taxonomy: 2018 Release». International Committee on Taxonomy of Viruses (ICTV) (på engelsk). oktober 2018. Arkivert fra originalen 20. mars 2020. Besøkt 13. januar 2019.
Woo, Patrick C. Y.; Huang, Yi; Lau, Susanna K. P.; Yuen, Kwok-Yung (24. august 2010). «Coronavirus Genomics and Bioinformatics Analysis». Viruses. 2 (8): 1804–1820. PMC3185738. PMID21994708. doi:10.3390/v2081803. «Figure 2. Phylogenetic analysis of RNA-dependent RNA polymerases (Pol) of coronaviruses with complete genome sequences available. The tree was constructed by the neighbor-joining method and rooted using Breda virus polyprotein.»
web.archive.org
«Virus Taxonomy: 2018 Release». International Committee on Taxonomy of Viruses (ICTV) (på engelsk). oktober 2018. Arkivert fra originalen 20. mars 2020. Besøkt 13. januar 2019.