1) Whittingham, D.G., Leibo, S.P. and Mazur, P. (1972): Survival of mouse embryos frozen to -196°C and -269°C. Science, 178, 411-414.
2) Wilmut, I. (1972): The effect of cooling rate, warming rate, cryoprotective agent and stage of development on survival of mouse embryos during freezing and thawing. Life Sci. PII, 11, 1017-1079.
3) Wilmut, I. and Rowson, L.E.A. (1973): Experiments on the low-temperature preservation of cow embryos. Vet. Rec., 92, 686-690.
4) Bank, H. and Maurer, R.R. (1974): Survival of frozen rabbit embryos. Exp. Cell Res., 89, 188-196.
5) Whittingham, D.G. and Adams, C.E. (1976): Low temperature preservation of rabbit embryos. J. Reprod. Fertil., 47, 269-274.