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Niemegeers CJ، Schellekens JH، van Bever WF، Janssen PA (1976). "Sufentanil, a very potent and extremely safe intravenous morphine-like compound in mice, rats and dogs". Arzneimittel-Forschung (Drug Research). ج. 26 ع. 8: 1551–6. ISSN:0004-4172. PMID:12772.
Niemegeers CJ، Janssen PA (1981). "Alfentanil (R39209)-a particularly short acting intravenous narcotic analgesic in rats". Drug Development Research. ج. 1: 830–8. DOI:10.1002/ddr.430010111. ISSN:0272-4391.