Sequence-optimised E2 constructs from BVDV-1b and BVDV-2 for DNA immunisation in cattle., Couvreur, Bernard, Letellier Carine, Olivier Fabrice, Dehan Pierre, Elouahabi Abdelatif, Vandenbranden Michel, Ruysschaert Jean-Marie, Hamers Claude, Pastoret Paul-Pierre, and Kerkhofs Pierre , Vet Res, 2007 Nov-Dec, Volume 38, Issue 6, p.819-34, (2007)