1. M.B. Pensaert, P. de Bouck, Arch. Virol. 58, 243–247 (1978)
2. C.H. Kweon, B.J. Kwon, T.S. Jung, Y.J. Kee, D.H. Hur, E.K. Hwang, J.C. Rhee, S.H. An, Korean J Vet Rec 33, 249–254 (1993)
3. M.B. Pensaert, in Disease of Swine, ed. by B.E. Straw, S. D’Allaire, W.L. Mengeling, D.I. Taylor (The Iowa University Press, Ames, IA 1999), pp. 179–185
4. M. Duarte, H. Laude, J Gen Virol 75, 1195–1200 (1994)
5. H.F. Egberink, J. Ederveen, P. Callebaut, M.C. Horzinek, J Vet Res 49, 1320–1324 (1988)