Preparation, characterization and catalytic studies of 'V IND. 2'O IND. 5'-'S IND.i'O IND. 2' xerogel composite - Barbosa, Glauciane do Nascimento; MacLeod, Tatiana C. O.; Guedes, Débora F. C.; Assis, Marilda D; Oliveira, Herenilton P. (Journal of Sol-Gel Science and Technology, 2008)