Hashim, M.M., et al. “Effect of β-Mannanase Enzymes Supplementation to Energy Deficient Diets on Productive Performance, Physiological and Carcass Traits of Broilers”. International Journal of Poultry Science, vol. 19, no. 10, Sept. 2020, pp. 455–466, https://doi.org/10.3923/ijps.2020.455.466.