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L. U. Sneddon , V. A. Braithwaite , and M. J. Gentle , “Do Fish Have Nociceptors? Evidence for the Evolution of a Vertebrate Sensory System,” Proceedings of the Royal Society London B, 270, 1520 (2003): 1115–21.
Kent C. Berridge and Elliot S. Valenstein , “What Psychological Process Mediates Feeding Evoked by Electrical-Stimulation of the Lateral Hypothalamus,” Behavioral Neuroscience, 105, 1 (1991): 3–14.