7Fougner J A, Aamdal J, Andersen K. Intrauterine insemination with frozen semen in the blue fox [J]. Nord Vet Med, 1973, 25 (3) : 144-149.
8MOiler O M, Mondain-Monval M, Smith A, et al. Temporal rela- tionships between hormonal concentrations and the electrical resist- ance of the vaginal tract of blue foxes (Alopex lagopus) at pro-oes- trus and oestrus [J]. J Reprod Fertil, 1984, 70 (1) : 15-24.