Relaxation phenomena in XPS of heteropolymetalate cellulose-esthers - Oliveira, Francílio de Carvalho; Pireaux, Jean-Jacques; Plepis, Ana Maria de Guzzi; Schneider, José Fabian; Landers, Richard; Siervo, Abner; Rodrigues Filho, Ubirajara Pereira (Brazilian/German Workshop on Applied Surface Science, 2001)