1. Amrein-Schneider E. M. 1999 Ultraschalluntersuchungen bei Kühen mit Blinddarmdilatation. DrMedVet thesis University of Zurich Switzerland
2. Ultrasonographic findings in cows with dilatation, torsion and retroflexion of the caecum;Braun;Veterinary Record,2002
3. Ultrasonographic examination of the omasum in 30 healthy cows;Braun;Veterinary Record,2006
4. Influence of age, breed, and stage of pregnancy on hepatic ultrasonographic findings in cows;Braun;American Journal of Veterinary Research,1994