Paola Gilli; Valerio Bertolasi; Loretta Pretto; et al. (2002). "The Nature of Solid-State N−H···O/O−H···N Tautomeric Competition in Resonant Systems. Intramolecular Proton Transfer in Low-Barrier Hydrogen Bonds Formed by the ···OC−CN−NH··· ⇄ ···HO−CC−NN··· Ketohydrazone−Azoenol System. A Variable-Temperature X-ray Crystallographic and DFT Computational Study". J. Am. Chem. Soc. 124 (45): 13554–13567. doi:10.1021/ja020589x. PMID12418911.
K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371
Bafana, Amit; Devi, Sivanesan Saravana; Chakrabarti, Tapan (28 September 2011). "Azo dyes: past, present and the future". Environmental Reviews. 19 (NA): 350–371. doi:10.1139/a11-018. ISSN1181-8700.
Eva Engel; Heidi Ulrich; Rudolf Vasold; et al. (2008). "Azo Pigments and a Basal Cell Carcinoma at the Thumb". Dermatology. 216 (1): 76–80. doi:10.1159/000109363. PMID18032904. S2CID34959909.
Paola Gilli; Valerio Bertolasi; Loretta Pretto; et al. (2002). "The Nature of Solid-State N−H···O/O−H···N Tautomeric Competition in Resonant Systems. Intramolecular Proton Transfer in Low-Barrier Hydrogen Bonds Formed by the ···OC−CN−NH··· ⇄ ···HO−CC−NN··· Ketohydrazone−Azoenol System. A Variable-Temperature X-ray Crystallographic and DFT Computational Study". J. Am. Chem. Soc. 124 (45): 13554–13567. doi:10.1021/ja020589x. PMID12418911.
Eva Engel; Heidi Ulrich; Rudolf Vasold; et al. (2008). "Azo Pigments and a Basal Cell Carcinoma at the Thumb". Dermatology. 216 (1): 76–80. doi:10.1159/000109363. PMID18032904. S2CID34959909.
Eva Engel; Heidi Ulrich; Rudolf Vasold; et al. (2008). "Azo Pigments and a Basal Cell Carcinoma at the Thumb". Dermatology. 216 (1): 76–80. doi:10.1159/000109363. PMID18032904. S2CID34959909.