by Wilson, D, Pettifer, G.R, Hosgood, G
Published in Journal of the American Veterinary Medical Association (01.04.2006)

by Davidson, C.D, Pettifer, G.R, Henry, J.D. Jr
Published in Journal of the American Veterinary Medical Association (2004)

by Bolt, D.M, Burba, D.J, Hubert, J.D, Pettifer, G.R, Hosgood, G.L
Published in Canadian journal of veterinary research (01.10.2004)

by Dyson, D.H, Pettifer, G.R
Published in Canadian journal of veterinary research (01.10.1997)

by Holmberg, D.L, Pettifer, G.R
Published in Canadian veterinary journal (01.10.1997)

by Pettifer, G.R, Dyson, D.H, McDonnell, W.N
Published in Canadian journal of veterinary research (1996)