J. D. S. de Oliveira, F. L. Fertonani, C. B. Melios, and M. Ionashiro, “Thermal behaviour studies of solid state compounds of cinnamylidenepyruvate with trivalent lanthanides and yttrium (III) in an atmosphere of CO2”, Eclet. Quim., vol. 27, no. 1, pp. 11–19, Dec. 2002.