by Roepstorff, A, Nilsson, O, Oksanen, A, Gjerde, B, Richter, S.H, Örtenberg, E, Christensson, D, Martinsson, K.B, Bartlett, P.C, Nansen, P, Eriksen, L, Helle, O, Nikander, S, Larsen, K
Published in Veterinary parasitology (30.04.1998)

by Bjoerk, A.K.K, Olsson, N.G.E, Martinsson, K.B, Goeransson, L.A.T. (AB Ferrosan, PO Box 839, 20180 Malmoe (Sweden))
Published in Animal Production (UK) (1987)