Melanin-like units concentration effects in melanin-like/ vanadium pentoxide hybrid compounds - Arashiro, Everaldo; Zampronio, Elaine Cabrini; Brunello, Carlos Alberto; Lassali, Tânia Aparecida Farias; Oliveira, Herenilton Paulino; Graeff, Carlos Frederico de Oliveira (International Journal of Inorganic Materials 1, 2001)