8Willians JD. Importance of beta- lactamases and clinical implications of their inhibitors[J]. Drugs, 1989,35 ( Suppl 7) :S 3.
9Kemal C,Knowles JR. Penicillanic acid sulfone:interaction with RTEM β- lactamase from Esoherichia coli at different pH values[J] .Biochemistry, 1981,20:3688.
10Shimada K. Clinical evaluation of sulbactam/amipicillin in Japan[J].Diagn Microbiol Inject Dis, 1989,12(suppl 4) :S171.