RT Book, Section SR Electronic(1) A1 Bray, Jonathan YR 2011 T1 Tumours of the perianal region T2 BSAVA Manual of Canine and Feline Oncology PB British Small Animal Veterinary Association DO 10.22233/9781905319749.15.7 UL https://www.bsavalibrary.com/content/chapter/10.22233/9781905319749.chap15g