Mozumder, N. H. M. R., M. Akhtaruzzaman, M. A. Bakr, and F. T. Zohra. “Study on Isolation and Partial Purification of Lactase (Β-Galactosidase) Enzyme from Lactobacillus Bacteria Isolated from Yogurt”. Journal of Scientific Research, vol. 4, no. 1, Dec. 2011, p. 239, doi:10.3329/jsr.v4i1.8478.