Isolation of a glycoprotein E-deleted bovine herpesvirus type 1 strain in the field., Dispas, Marc, Schynts F, Lemaire M, Letellier C, Vanopdenbosch E, Thiry E, and Kerkhofs Pierre , Vet Rec, 2003 Aug 16, Volume 153, Issue 7, p.209-12, (2003)