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Morgan, M. M., Sohn, J.-H., Lohof, A. M., Ben-Eliyahu, S., & Liebeskind, J. C. (1989). Characterization of stimulation-produced analgesia from the nucleus tractus solitarius in the rat. Brain Research, 486(1), 175–180. doi:10.1016/0006-8993(89)91291-2 
10.1016/0006-8993(89)91291-2