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Lamb, C R and Wrigley, R H and Simpson, K W and VanHijfte, M F and Garden, O A and Smyth, J B A and Rutgers, H C and White, R N (1996) Ultrasonographic diagnosis of portal vein thrombosis in four dogs. VETERINARY RADIOLOGY & ULTRASOUND, 37 (2). pp. 121-129.