Fürst, Z; Búzás, B; Friedmann, T; Schmidhammer, H; Borsodi, A (1993). „Highly potent novel opioid receptor agonist in the 14-alkoxymetopon series”. European Journal of Pharmacology. 236 (2): 209—15. PMID8391457. doi:10.1016/0014-2999(93)90591-5.
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US 6476044, Wnendt Stephan, Strassburger Wolfgang, Buschmann Helmut, Reiss-Mueller Elke, Krueger Thomas, "Use Of Morphine Derivatives As Medicaments For The Treatment Of Neuropathic Problems"
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Fürst, Z; Búzás, B; Friedmann, T; Schmidhammer, H; Borsodi, A (1993). „Highly potent novel opioid receptor agonist in the 14-alkoxymetopon series”. European Journal of Pharmacology. 236 (2): 209—15. PMID8391457. doi:10.1016/0014-2999(93)90591-5.