1. The Placentation of Erinaceus europaeus with remarks on the phylogeny of the placenta;Hubrecht;Quart. J. Microsc. Sci.,1889
2. The yolk-sacs of Erinaceus europaea and Putorius furo;Morris;J. Embryol. Exp. Morphol.,1953
3. Some histochemical observations on the endometrium and the yolk-sac placenta of Erinaceus europaea;Morris;J. Embryol. Exp. Morphol.,1957
4. Pre-implantation phenomena in the uterus of Elephantulus;Van der Horst;S Afr. J. Med. Sci.,1942
5. Placentation in mammals once grouped as insectivores;Carter;Int. J. Dev. Biol.,2010