Del Palacio, M. J. F., Fuentes, V. L., Bonagura, J. D., Schober, K. E., Hatfield, D. G., & Laughlin, M. H. Evaluation of transcutaneous Doppler ultrasonography for the measurement of blood flow in the femoral artery of pigs. AMERICAN JOURNAL OF VETERINARY RESEARCH, 64(1), 43-50