1. BRAMBELL, F. W. R. (1966). Lancet, 2, 1087.
2. DEACON, W. E., FALCONE, V. H., and HARRIs, A. (1957). Proc. Soc. exp. Biol. (N. Y.), 96, 477.
3. -, LUCAS, J. B., and PRICE, E. V. (1966).
4. GARTNER, H. (1965). Z. Geburtsh. Gynak., 164, 225.
5. Observations on the selective permeability of the human placenta to plasma proteins and proteins hormones', in 'Radioisotope Techniques in the Study of Protein Metabolism;GITLIN, D.;Int. Atomic Energy Agency Tech. Rep. Ser,1965