Harnentis, Y. Marlida, Y. Rizal, and M. E. Mahata, “Isolation, Characterization and Production of Mannanase from Thermophilic Bacteria to Increase the Feed Quality”, Pak. J. Nutr., vol. 12, no. 4, pp. 360–364, Mar. 2013, doi: 10.3923/pjn.2013.360.364.