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- [4] PREGNANCY DIAGNOSIS IN PIG, CATTLE AND BITCH BY AN ULTRASONIC DOPPLER INSTRUMENT JAPANESE JOURNAL OF VETERINARY SCIENCE, 1970, 32 : 148 - &
- [10] PREGNANCY DIAGNOSIS IN THE PIG BY MEANS OF ULTRASONIC ZUCHTHYGIENE-REPRODUCTION IN DOMESTIC ANIMALS, 1982, 17 (02): : 78 - 83