@incollection{:/content/chapter/10.22233/9781910443194.chap12, author = "Lierz, Michael", title = "Endoscopy, biopsy and endosurgery", booktitle = "BSAVA Manual of Backyard Poultry Medicine and Surgery", publisher = "British Small Animal Veterinary Association", year = "2019", pages = "105-125", url = "https://www.bsavalibrary.com/content/chapter/10.22233/9781910443194.chap12" }