by Evans, R.I, Herbold, J.R, Bradshaw, B.S, Moore, G.E
Published in Journal of the American Veterinary Medical Association (15.10.2007)

by POPP, R.A., BRADSHAW, B.S., SKOW, L.C.
Published in Differentiation (London) (01.01.1980)

by Bradshaw, B S, Wolfe, H G
Published in Biology of reproduction (01.04.1977)