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Merck & Co (2008) '''The Merck Veterinary Manual'''
 
Merck & Co (2008) '''The Merck Veterinary Manual'''
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Dobson, J.M. and Lascelles, B.D.X. (2003) '''BSAVA Manual of Canine and Feline Oncology (2nd Edition)''' ''BSAVA''
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