↑Gaulton A, Bellis LJ, Bento AP, Chambers J, Davies M, Hersey A, Light Y, McGlinchey S, Michalovich D, Al-Lazikani B, Overington JP. (2012). „ChEMBL: a large-scale bioactivity database for drug discovery”. Nucleic Acids Res40 (Database issue): D1100-7. DOI:10.1093/nar/gkr777. PMID21948594.
↑US Patent 3792080 - Process for Substituted Cyclohexenes & it's Products
↑J Clin Pharmacol. 2002 Nov ;42 (11):1257-61 - Sequential first-pass metabolism of nortilidine: the active metabolite of the synthetic opioid drug tilidine
↑Opiates: George R. Lenz page 439, Table 9-30 (78)