1. Alexander, G., 1964, Studies on the placenta of the sheep (Ovis aries L.). Effect of surgical reduction in the number of caruncles, J. Reprod. Fertil. 7:307.
2. Alexander, G., and Williams, D., 1968, Hormonal control of amniotic and allantoic fluid volume in ovariectomized sheep, J. Endocrinol. 41:477.
3. Altshuler, G., and Russell, P., 1975, The human placental villitides, Curr. Top. Pathol. 60:63.
4. Beischer, N. A., Sivasamboo, R., Vohra, S., Silpisorukosal, S., and Reid, S., 1970, Placental hypertrophy in severe pregnancy anaemia, J. Obstet. Gynaecol. Br. Commonw. 77:398.
5. Benirschke, K., 1972, Chimerism, mosaicism and hybrids, in: Human Genetics (J. de Grouchy, F. J. G. Ebling, and I. W. Henderson, eds.), pp. 212–231, Exerpta Medica, Amsterdam.