Borer-Weir, K. E., Bailey, S. R., Harris, P. A., Menzies-Gow, N. J., & Elliott, J. Seasonal variation in maintenance of phenylephrine-induced tone in isolated equine digital arteries under hypoxic or hyperoxic conditions in vitro. RESEARCH IN VETERINARY SCIENCE, 94(3), 725-727. https://doi.org/10.1016/j.rvsc.2013.01.010