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Mounteney J, Giraudon I, Denissov G, Griffiths P (July 2015). "Fentanyls: Are we missing the signs? Highly potent and on the rise in Europe". The International Journal on Drug Policy. 26 (7): 626–631. doi:10.1016/j.drugpo.2015.04.003. PMID25976511.
Maguire P, Tsai N, Kamal J, Cometta-Morini C, Upton C, Loew G (March 1992). "Pharmacological profiles of fentanyl analogs at mu, delta and kappa opiate receptors". European Journal of Pharmacology. 213 (2): 219–225. doi:10.1016/0014-2999(92)90685-W. PMID1355735.
Mounteney J, Giraudon I, Denissov G, Griffiths P (July 2015). "Fentanyls: Are we missing the signs? Highly potent and on the rise in Europe". The International Journal on Drug Policy. 26 (7): 626–631. doi:10.1016/j.drugpo.2015.04.003. PMID25976511.