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Endoh T, Matsuura H, Tajima A, Izumimoto N, Tajima C, Suzuki T, et al. (1999). "Potent antinociceptive effects of TRK-820, a novel kappa-opioid receptor agonist". Life Sciences. 65 (16): 1685–1694. doi:10.1016/s0024-3205(99)00417-8. PMID10573186.
Suzuki T, Izumimoto N, Takezawa Y, Fujimura M, Togashi Y, Nagase H, et al. (January 2004). "Effect of repeated administration of TRK-820, a kappa-opioid receptor agonist, on tolerance to its antinociceptive and sedative actions". Brain Research. 995 (2): 167–175. doi:10.1016/j.brainres.2003.09.057. PMID14672806. S2CID25094224.
Nakao K, Mochizuki H (May 2009). "Nalfurafine hydrochloride: a new drug for the treatment of uremic pruritus in hemodialysis patients". Drugs of Today. 45 (5): 323–329. doi:10.1358/dot.2009.45.5.1377595. PMID19584962.
Endoh T, Matsuura H, Tajima A, Izumimoto N, Tajima C, Suzuki T, et al. (1999). "Potent antinociceptive effects of TRK-820, a novel kappa-opioid receptor agonist". Life Sciences. 65 (16): 1685–1694. doi:10.1016/s0024-3205(99)00417-8. PMID10573186.
Suzuki T, Izumimoto N, Takezawa Y, Fujimura M, Togashi Y, Nagase H, et al. (January 2004). "Effect of repeated administration of TRK-820, a kappa-opioid receptor agonist, on tolerance to its antinociceptive and sedative actions". Brain Research. 995 (2): 167–175. doi:10.1016/j.brainres.2003.09.057. PMID14672806. S2CID25094224.
Suzuki T, Izumimoto N, Takezawa Y, Fujimura M, Togashi Y, Nagase H, et al. (January 2004). "Effect of repeated administration of TRK-820, a kappa-opioid receptor agonist, on tolerance to its antinociceptive and sedative actions". Brain Research. 995 (2): 167–175. doi:10.1016/j.brainres.2003.09.057. PMID14672806. S2CID25094224.