Ahmad R. Shahverdi et al. 2007. Enhancement Effect of Berberis vulgaris var. integerrima Seeds on the Antibacterial Activity of Cephalosporins against Staphylococcus aureus and Escherichia coli: Synergistic effect of Berberis vulgaris and cephalosporins. Iranian Journal of Pharmaceutical Sciences. 3, 3 (Jul. 2007), 181–186. DOI:https://doi.org/10.22037/ijps.v3.41018.