1. The healthy neonatal foal: routine examinations and preventive medicine;Acworth;Equine Veterinary Education,2003
2. Equine placentation;Allen;Reproduction Fertility and Development,2001
3. Comparative placentation—a workshop report;Allen;Placenta,2003
4. Alanto-chorionic differentiations in the carnívora;Amoroso;Journal of Anatomy,1952
5. Early development of the human placenta;Benirschke,1995