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- [4] ULTRASONIC ECHOGRAPHY FOR EARLY-PREGNANCY DIAGNOSIS IN SOWS ANNALES DE ZOOTECHNIE, 1984, 33 (03): : 402 - 402
- [6] ULTRASONIC DIAGNOSIS IN EARLY-PREGNANCY - METHODOLOGY, VALUE AND PROBLEMS IN DIFFERENTIAL-DIAGNOSIS ZENTRALBLATT FUR GYNAKOLOGIE, 1977, 99 (16): : 979 - 984
- [7] EARLY-PREGNANCY DIAGNOSIS WITH A BATTERY-OPERATED ULTRASONIC SCANNER IN SOWS CANADIAN VETERINARY JOURNAL-REVUE VETERINAIRE CANADIENNE, 1992, 33 (05): : 340 - 342
- [10] EARLY-PREGNANCY DIAGNOSIS IN SWINE VETERINARY MEDICINE & SMALL ANIMAL CLINICIAN, 1975, 70 (03): : 290 - 290