1. Potential contribution of cryopreserved germplasm to the preservation of genetic diversity and conservation of endangered species in captivity;Ballou;Cryobiology,1992
2. Carbyn, L.N., 1987. Grey wolf and red wolf. In: Novak, M., Baker, J.A., Obbard, M.E., Malloch, B. (Eds.), Wild Furbearer Management and Conservation in North America. Ontario Ministry of Natural Resources, pp. 359–376.
3. Christiansen, I.J., 1984. Andrology of the normal male. In: Christiansen, I.J. (Ed.), Reproduction in the Dog and Cat. Bailliere-Tindall, London, pp. 80–109.
4. Seminal characteristics and fertility in dogs;England;Vet. Rec.,1989
5. Effects of cooling and glycerol on penetration of oocyte by spermatozoa in dogs;Hay;J. Reprod. Fertil. Suppl.,1997