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Savage, Kathleen A and Colahan, Patrick T and Tebbett, Ian R and Rice, Brett L and Freshwater, Lester L and Jackson, Christie A (2005) Effects of caffeine on exercise performance of physically fit thoroughbreds. American Journal of Veterinary Research, 66 (4). pp. 569-573.
Collins, S.B. and Perez-Camargo, G. and Gettinby, G. and Butterwick, R.F. and Batt, R.M. and Giffard, C.J. (2001) Development of a technique for the in vivo assessment of flatulence in dogs. American Journal of Veterinary Research, 62 (7). pp. 1014-1019.
Welsh, E.M. and Gettinby, G. and Nolan, A.M. (1993) Comparison of a visual analog scale and a numerical rating scale for assessment of lameness, using sheep as a model. American Journal of Veterinary Research, 54 (6). pp. 976-983.