1. The influence of fetal genotype upon endometrial cup development and PMSG and progestagen production in equids;Allen;J. Reprod. Fert.,1975
2. Immunological aspects of the endometrial cup reaction and the effects of xenogeneic pregnancy in horses and donkeys;Allen;J. Reprod. Fert.,1982
3. Allen , W. R. Sanderson , M. W. 1987 The value of a rapid progesterone assay (AELIA) in equine stud veterinary medicine and management Proc. 9th Bain-Fallon Memorial lectures: The Mare and Foal 31 41
4. The origin of equine endometrial cups. II. Invasion of the endometrium by trophoblast;Allen;Anat. Rec.,1973
5. Extraspecific donkey-in-horse pregnancy as a model of early fetal death;Allen;J. Reprod. Fert.,1987