(en) Kanehisa M, Goto S, Hattori M, Aoki-Kinoshita KF, Itoh M, Kawashima S, Katayama T, Araki M, Hirakawa M (2006). From genomics to chemical genomics: new developments in KEGG. Nucleic Acids Res34 (Database issue): D354–7. PMID16381885. PMC1347464. DOI: 10.1093/nar/gkj102.
(en) Kanehisa M, Goto S, Hattori M, Aoki-Kinoshita KF, Itoh M, Kawashima S, Katayama T, Araki M, Hirakawa M (2006). From genomics to chemical genomics: new developments in KEGG. Nucleic Acids Res34 (Database issue): D354–7. PMID16381885. PMC1347464. DOI: 10.1093/nar/gkj102.