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7. Fetal electrocardiography in the mare as a practical aid to diagnosing singleton and twin pregnancy. Parkes RD, Colles CM. Vet Rec; 1977 Jan 08; 100(2):25-6. PubMed ID: 836600 [Abstract] [Full Text] [Related]
8. [Possibilities and limits of pregnancy diagnosis in domestic animals using the ultrasonic Doppler technic]. Weiss G. Schweiz Arch Tierheilkd; 1975 Mar 08; 117(3):123-34. PubMed ID: 1209256 [No Abstract] [Full Text] [Related]
18. Utility of echocardiography in the diagnosis and management of fetal arrhythmias. Fesslovà V, Bellotti M, Ferrazzi E, Brina A. Cardiologia; 1988 Sep 08; 33(9):833-9. PubMed ID: 3228811 [No Abstract] [Full Text] [Related]
19. Real-time ultrasonography for determining the gestational age of ewes. Aiumlamai S, Fredriksson G, Nilsfors L. Vet Rec; 1992 Dec 12; 131(24):560-2. PubMed ID: 1481347 [Abstract] [Full Text] [Related]