Cương, Đỗ Biên, et al. “BIOCONVERSION OF COPRA MEAL INTO PREBIOTIC MANNOOLIGOSACCHARIDES USING ENDO-β-1,4-MANNANASE PRODUCING BY ASPERGILLUS NIGER BK 01”. <i>Vietnam Journal of Science and Technology</i>, vol. 48, no. 3, June 2012, doi:10.15625/0866-708X/48/3/1139.