The role of citrate precursors on the morphology of lanthanide oxides obtained by thermal decomposition - Silva, Mauro Francisco Pinheiro da; Carvalho, Flavio Machado de Souza; Martins, Tereza da Silva; Fantini, Márcia Carvalho de Abreu; Isolani, Paulo Celso (Journal of Thermal Analysis and Calorimetry, 2010)