Zurmiati, Wizna, M. H. Abbas, and M. E. Mahata, “Production of Extracellular β-mannanase by Bacillus amyloliquefaciens on a Coconut Waste Substrate”, Pak. J. Nutr., vol. 16, no. 9, pp. 700–707, Aug. 2017, doi: 10.3923/pjn.2017.700.707.