Activatory Effects of Manganese and Cobalt Ions on the Activity of Cellulase Produced by Aspergillus niger. Nigerian Journal of Biochemistry and Molecular Biology, Nigeria, v. 28, n. 1&2, p. 60–68, 2013. Disponível em: https://www.nsbmb.org.ng/journals/index.php/njbmb/article/view/315. Acesso em: 3 jun. 2026.