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Spadavecchia, Claudia; Arendt-Nielsen, Lars; Spadavecchia, Luciano; Mosing, Martina; Auer, Ulricke; van den Hoven, Renè (2007). Effects of butorphanol on the withdrawal reflex using threshold, suprathreshold and repeated subthreshold electrical stimuli in conscious horses. Veterinary anaesthesia and analgesia, 34(1), pp. 48-58. Oxford: Blackwell Science 10.1111/j.1467-2995.2006.00289.x
