1. The influence of fetal genotype on endometrial cup development and PMSG and progestagen production in pregnant mares;Allen;J Reprod Fertil Suppl,1975
2. Immunological aspects of the endometrial cup reaction and the effects of xenogeneic pregnancy in horses and donkeys;Allen;J Reprod Fertil Suppl,1982
3. The value of a rapid progesterone assay in equine stud veterinary medicine management;Allen,1987
4. The origin of equine endometrial cups II Invasion of the endometrium by trophoblast;Allen;Anat Rec,1973
5. Extra species donkey-in-horse pregnancy as a model of early fetal death;Allen;J Reprod Fertil Suppl,1987