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Gorgas, Daniela (2011). Physical principles. In: Barr, Frances; Gaschen, Lorrie (eds.) BSAVA Manual of Canine and Feline Ultrasonography. BSAVA British Small Animal Veterinary Association
Lang, J (2006). Lumbosacral region and cauda equina syndrome. In: Barr F, Kirberger R (ed.) (pp. 257-271). BSAVA British Small Animal Veterinary Association