http://www.sciencedirect.com/science/article/pii/B9780122499517500031/pdfft?md5=9a9d5ea5e9e80328103d63b57fca3e74&pid=3-s2.0-B9780122499517500031-main.pdf and the citation is Ball, L.,2005.Theuniversaltaxonomyofvirusesintheoryandpractice.In:Fauquet,

C., Mayo,M.,Maniloff,J.,Desselberger,U.,Ball,L.(Eds.),VirusTaxonomy:

Classification andNomenclatureofViruses:EighthReportoftheInternational

CommitteeontheTaxonomyofViruses.Elsevier,AcademicPress,Amsterdam;

Boston,pp.3–8.