L. L. Durocher, Hinchcliff, K. W., Williamson, K. K., McKenzie, E. C., Holbrook, T. C., Willard, M., Royer, C. M., and Davis, M. S.,
“Effect of strenuous exercise on urine concentrations of homovanillic acid, cortisol, and vanillylmandelic acid in sled dogs.”,
American journal of veterinary research, vol. 68, no. 1, pp. 107-11, 2007.