^Ismail, S.; Khattab, O. K.; Nour, S.; Abo-Elnasr, A.; El-Refai, M.; Hashem, A. (2014). "Improved mannanase production from Penicillium humicola and application for hydrolysis property". Egyptian Pharmaceutical Journal. 13 (2): 160. doi:10.4103/1687-4315.147102.