1. Ultrasonics for pregnancy detection;Allison;N.Z. Jl. Agric.,1971
2. The concentration of progesterone in the peripheral plasma of the pregnant ewe;Bassett;J. Endocrin.,1969
3. X-Ray Diagnosis of Pregnancy in Ewes
4. Pregnancy diagnosis in sheep and goats: Field tests with an ultrasound unit;Bon Durant;California Vet.,1980
5. The control of parturition in the ewe;Bosc;J. Reprod. Fert.,1971