[Clinical signs and diagnosis of a severe primary infection with BVDV subtype 1b in a dairy herd]., Muskens, J, van Ruitenbeek H W., Letellier C, Kerkhofs Pierre, and van Maanen C , Tijdschr Diergeneeskd, 2004 Sep 15, Volume 129, Issue 18, p.584-8, (2004)