1. Psittacine Beak and Feather Disease Virus Nucleotide Sequence Analysis and Its Relationship to Porcine Circovirus, Plant Circoviruses, and Chicken Anaemia Virus
2. Classification of TTV and Related Viruses (Anelloviruses)
3. Biagini P.2011.Restructuring and expansion of the familyAnelloviridae.http://talk.ictvonline.org/files/proposals/taxonomy_proposals_general1/m/gen01/default.aspx. Oct 14 2011.
4. Biagini P.2011.Restructuring and expansion of the familyCircoviridae.http://talk.ictvonline.org/files/proposals/taxonomy_proposals_general1/m/gen01/default.aspx. Oct 14 2011.
5. Apoptosis–inducing proteins in chicken anemia virus and TT virus;Smit M.H.;Curr Top Microbiol Immunol.,2009