1. Merwin HE (1931) In: Morris HE, Charlot J, Morris AA (eds) Yucatan, Temple Warriors at Chitchen Itza. Carnegie Institution, Washington, DC, p 356
2. Gettens RJ, Stout GL (eds) (1946) Paint materials: a short encyclopedia. Van Nostrand, New York
3. Reyes-Valerio C (1993) De Bonampak al Templo Mayor: el azul Maya en Mesoamérica. Siglo XXI, México
4. Romero P, Sánchez C (2005) New J Chem 29:57
5. Shepard AO (1962) Am Antiq 27:565