Bukar, A., Abbas, M. I, Milala, M. A, Isa, M. A, Allamin, I. A, & Ismail, H. Y. (2016). Optimization of Cellulase Activity by Aspergillus niger and Penicillium chrysogenum using Some Agricultural Wastes. UMYU Journal of Microbiology Research (UJMR), 1(1), 189–196. https://doi.org/10.47430/ujmr.1611.025