1. Biggs PM 1982. The epidemiology of avian herpesviruses in veterinary medicine. Dev. Biol. Stand. 52:3-11.
2. OIE Handistatus 2002. World Animal Health Publication and Handistatus II (dataset for 2001). Paris France: Office International des Epizooties.
3. OIE Handistatus 2003. World Animal Health Publication and Handistatus II (dataset for 2002). Paris France: Office International des Epizooties.
4. OIE Handistatus 2004. World Animal Health Publication and Handistatus II (data set for 2003). Paris France: Office International des Epizooties.
5. OIE Handistatus 2005. World Animal Health Publication and Handistatus II (data set for 2004). Paris France: Office International des Epizooties.