M. I. G. Leles, C. B. Melios, L. M. . D’Assunção, and M. Ionashiro, “Preparation and thermal behavior of mixture of basic carbonate and 4-dimethylaminocinnamylidenepyruvate with lanthanides (III) and yttrium (III) in the solid state”, Eclet. Quim., vol. 24, no. 1, pp. 29–44, Dec. 1999.