Noda M, Teranishi Y, Takahashi H, Toyosato M, Notake M, Nakanishi S, Numa S (xuño de 1982). "Isolation and structural organization of the human preproenkephalin gene". Nature297 (5865): 431–4. Bibcode:1982Natur.297..431N. PMID6281660. doi:10.1038/297431a0.
Janecka A, Fichna J, Janecki T (2004). "Opioid receptors and their ligands". Current Topics in Medicinal Chemistry4 (1): 1–17. PMID14754373. doi:10.2174/1568026043451618.
Noda M, Teranishi Y, Takahashi H, Toyosato M, Notake M, Nakanishi S, Numa S (xuño de 1982). "Isolation and structural organization of the human preproenkephalin gene". Nature297 (5865): 431–4. Bibcode:1982Natur.297..431N. PMID6281660. doi:10.1038/297431a0.
Noda M, Teranishi Y, Takahashi H, Toyosato M, Notake M, Nakanishi S, Numa S (xuño de 1982). "Isolation and structural organization of the human preproenkephalin gene". Nature297 (5865): 431–4. Bibcode:1982Natur.297..431N. PMID6281660. doi:10.1038/297431a0.
Janecka A, Fichna J, Janecki T (2004). "Opioid receptors and their ligands". Current Topics in Medicinal Chemistry4 (1): 1–17. PMID14754373. doi:10.2174/1568026043451618.