Surface morphology of cellulose esthers-phosphotungstic acid nanocomposites - Andrade, L. M.; Rodrigues Filho, Ubirajara Pereira; Milanez, Juliana; Oliveira, F. C.; Castro, A. C.; Li, M. S.; Duwez, A. S.; Poleunis, C.; Pireaux, J. J. (European Conference on Applications of Surface and Interface Analysis, 2003)