Jarjees, S., شاکر, M. Alleh, and محمود. “Investigation of Beta-Lactase Enzymes in Chromosomal Bacilli Isolated from Diarrhea in Children”. Journal of Education and Science (JES), vol. 21, no. 4, Dec. 2008, pp. 45-54, doi:10.33899/edusj.2008.56093.