1. Adams SM, Biazik JM, Thompson MB, Murphy CR (2005) Cyto-epitheliochorial placenta of the viviparous lizard Pseudemoia entrecasteauxii: a new placental morphotype. J Morphol 264:264–276
2. Albergotti LC, Guillette LJ Jr (2011) Viviparity in reptiles: evolution and reproductive endocrinology. In: Norris DO, Lopez KH (eds) Hormones and reproduction of vertebrates. Elsevier, Amsterdam, pp 247–275
3. Allen WR, Wilsher S, Turnbull C, Stewart F, Ousey J, Rossdale PD, Fowden AL (2002) Influence of maternal size on placental, fetal and postnatal growth in the horse. I Development in Utero Reproduction 123:445–453
4. Amoroso EC (1960) Viviparity in fishes. Symp Zool S 1:153–181
5. Andrews RM (1997) Evolution of viviparity: variation between two sceloporine lizards in the ability to extend egg retention. J Zool 243:579–595