1. Insemination with deep frozen ram semen;Aamdal,1974
2. Freezing ram semen in aluminium packets and deep cervical insemination of ewes with a modified pipette;Ali,1988
3. Intrauterine and deep cervical insemination with frozen semen in sheep;Andersen;Zuchthygiene,1973
4. Results of artificial insemination in ewes using frozen semen;Boyarskij;Ovtsevodstvo,1978
5. A breeding trial using a transcervical technique for artificial insemination in sheep;Buckrell,1992