Classification of Dutch and German avian reoviruses by sequencing the $\sigma$ C protein Arie Kant, Francis Balk, Leontine Born, Dirk van Roozelaar, Jos Heijmans, Arno Gielkens and Agnes ter Huurne Vet. Res., 34 2 (2003) 203-212 DOI: 10.1051/vetres:2002067