Lennernäs B, Hedner T, Holmberg M, Bredenberg S, Nyström C, Lennernäs H (Feb 2005). "Pharmacokinetics and tolerability of different doses of fentanyl following sublingual administration of a rapidly dissolving tablet to cancer patients: a new approach to treatment of incident pain". Br J Clin. Pharmacol. doi:10.1111/j.1365-2125.2004.02264.x. PMID1884753.
Lennernäs B, Hedner T, Holmberg M, Bredenberg S, Nyström C, Lennernäs H (Feb 2005). "Pharmacokinetics and tolerability of different doses of fentanyl following sublingual administration of a rapidly dissolving tablet to cancer patients: a new approach to treatment of incident pain". Br J Clin. Pharmacol. doi:10.1111/j.1365-2125.2004.02264.x. PMID1884753.