A. B. de Siqueira, C. T. de Carvalho, E. C. Rodrigues, E. Y. Ionashiro, G. Bannach, and M. Ionashiro, “Synthesis, characterization and thermal behaviour on solid pyruvates of light trivalent lanthanides”, Eclet. Quim., vol. 32, no. 4, pp. 49–54, Dec. 2007.