Villena, Gretty K., and Marcel Gutiérrez-Correa. 2007. “Production of Lignocellulolytic Enzymes by Aspergillus Niger Biofilms at Variable Water Activities”. Electronic Journal of Biotechnology 10 (1). Valparaíso, Chile:0-0. https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v10n1-2.