Biodegradable films based on blends of gelatin and poly (vinyl alcohol): effect of PVA type or concentration on some physical properties of films - Silva, Gabriela Ghizi Damasceno da; Sobral, Paulo José do Amaral; Carvalho, Rosemary Aparecida de; Bergo, Paulo Victor Albuquerque; Mendieta-Taboada, Oscar; Bittante, Ana Mônica Quinta Barbosa (Journal of Polymers and the Environment, 2008)