1. Pasquini C, Spurgeon T, Pasquini S (2003) Anatomy of domestic animals, 10th edn. Sudz pblishing, Pilot Point, p 413
2. Braun U, Fohn J, Pusterla N (1994) Ultrasonographic examination of the ventral neck region in cows. Am J Vet Res 55:14–21
3. Buczinski S (2009) Cardiovascular ultrasonography in cattle. Vet Clin North Am 25:611–632
4. Mohamed T, Oikawa S (2007) Ultrasonographic characteristics of abdominal and thoracic abscesses in cattle and buffaloes. J Vet Med A 54:512–517
5. Radostits OM, Gay CC, Hinchcliff KW, Constable PD (2007) Diseases of the alimentary tract II. In: Veterinary medicine: a textbook of the diseases of cattle, horses, sheep, pigs and goats, 10th edn. Saunders Elsevier, Philadelphia, p 337–352