@incollection{:/content/chapter/10.22233/9781910443118.chap3, author = "Ohlerth, Stefanie", title = "Principles of the ultrasound examination", booktitle = "BSAVA Manual of Canine and Feline Ultrasonography", publisher = "British Small Animal Veterinary Association", year = "2011", pages = "21-23", url = "https://www.bsavalibrary.com/content/chapter/10.22233/9781910443118.chap3" }