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Riesen, Sabine C; Doherr, Marcus G; Lombard, Christophe W (2007). Comparison of Doppler-derived aortic velocities obtained from various transducer sites in healthy dogs and cats. Veterinary radiology & ultrasound, 48(6), pp. 570-3. Malden, Mass.: Blackwell 10.1111/j.1740-8261.2007.00299.x