2) ELLIOTT K & J WHELAN (eds.): The freezing of mammalian embryos. Ciba Foundation Symposium, 52, Elsevier, Amsterdam, 1977.
3) WHITTINGHAM DG: Principles of embryo preservation. In: Low Temperature Presavation in Medicine and Biology (ASHWOOD-SMITH MJ & JF FARRANT eds.), Chap. 4, p. 65, Pitman Medical, Kent, 1980.