Villena, G. K., and M. Gutiérrez-Correa. “Production of Lignocellulolytic Enzymes by Aspergillus Niger Biofilms at Variable Water Activities”. Electronic Journal of Biotechnology, vol. 10, no. 1, Jan. 2007, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v10n1-2.