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Hall, J.E., Simpson, J.W. and Williams, D.A., (2005) '''BSAVA Manual of Canine and Feline Gastroenterology (2nd Edition)''' ''BSAVA''
 
Hall, J.E., Simpson, J.W. and Williams, D.A., (2005) '''BSAVA Manual of Canine and Feline Gastroenterology (2nd Edition)''' ''BSAVA''
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Ettinger, S.J, Feldman, E.C. (2005)'''Textbook of Veterinary Internal Medicine''' (6th edition, volume 2)W.B. Saunders Company
 
Ettinger, S.J, Feldman, E.C. (2005)'''Textbook of Veterinary Internal Medicine''' (6th edition, volume 2)W.B. Saunders Company
  
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