Marianita Perez-Gonzalez, Clark D. Ridge & Adrian Weisz: Identification and quantification of the decarboxylated analogue of Pigments Red 57 and 57:1 in the color additives D&C Red No. 6, D&C Red No. 7, and their lakes, using a chelating agent and UHPLC. Food Additives & Contaminants: Part A, 2019, 36. vsk, nro 2, s. 212-224. Artikkelin verkkoversio. Viitattu 22.7.2022. (englanniksi)