1. Use of ultrasound for early diagnosis of single and twin pregnancies;Allen,1981
2. Inutero visualization of the fetal horse by ultrasonic scanning;O'Grady;Equine Practice,1981
3. Use of ultrasound scanning for ovarian examination and early diagnosis of pregnancy;Palmer,1981
4. Ultrasound appearance of the normal equine lung and surrounding viscera;Rantanen;Vet. Radiol,1981
5. Ultrasonography as a diagnostic aid in plerual effusion in the horse;Rantanen;Vet. Radiol,1981