by Wester P.W, Franken P, Haeni H.J
Published in The Veterinary Quarterly (1980)

by Goedegebuure S.A, Haeni H.J, Valk P.C. van der, Wal P.G. van der
Published in The Veterinary Quarterly (1980)

by Wester, P.W, Franken, P, Haeni, H.J. (Rijksuniversiteit Utrecht (Netherlands). Faculteit Diergeneeskunde)
Published in The Veterinary Quarterly (Netherlands) (1980)