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McGowan CM, Posner RE, Christley RM.McGowan CM, et al. Among authors: christley rm.Vet Rec. 2002 Apr 27;150(17):535-7. doi: 10.1136/vr.150.17.535.Vet Rec. 2002.PMID: 12019532
McGowan CM, Fordham T, Christley RM.McGowan CM, et al. Among authors: christley rm.Vet Rec. 2002 Nov 23;151(21):623-6. doi: 10.1136/vr.151.21.623.Vet Rec. 2002.PMID: 12479297
Upjohn MM, Archer RM, Christley RM, McGowan CM.Upjohn MM, et al. Among authors: christley rm.Vet Rec. 2005 Jun 11;156(24):763-6. doi: 10.1136/vr.156.24.763.Vet Rec. 2005.PMID: 15951498