Albers-Wolthers, C.H.J.; De Gier, J.; Walen, M.; Van Kooten, P.J.S.; Lambalk, C.B.; Leegwater, P.A.J.; Roelen, B.A.J.; Schaefers-Okkens, A.C.; Rutten, Victor P.M.G.; Millar, Robert P.; Kooistra, H.S.(Public Library of Science, 2017-06-26)
Kitshoff, Adriaan Mynhardt; Millward, Ian Ralph; Williams, June Heather; Clift, Sarah Jane; Kirberger, Robert M.(South African Veterinary Association, 2010-12)