Characterization of monoclonal antibodies directed against the bovine herpesvirus-1 glycoprotein E and use for the differentiation between vaccinated and infected animals., Letellier, C, Delangre A, De Smet A, and Kerkhofs Pierre , Vet Microbiol, 2001 Dec 04, Volume 83, Issue 4, p.301-15, (2001)