A universal avian endogenous real-time reverse transcriptase-polymerase chain reaction control and its application to avian influenza diagnosis and quantification., Van Borm, Steven, Steensels Mieke, Ferreira H L., Boschmans M, De Vriese J, Lambrecht Bénédicte, and van den Berg Thierry , Avian Dis, 2007 Mar, Volume 51, Issue 1 Suppl, p.213-20, (2007)