Garrido, MJ; Valle, M; Campanero, MA; Calvo, R; Trocóniz, IF (2000). „Modeling of the in vivo antinociceptive interaction between an opioid agonist, (+)-O-desmethyltramadol, and a monoamine reuptake inhibitor, (-)-O-desmethyltramadol, in rats”. The Journal of Pharmacology and Experimental Therapeutics. 295 (1): 352—9. PMID10992001.