English, A. R., Retsema, J. A., Girard, A. E., Lynch, J. E., & Barth, W. E. (1978). CP-45,899, a Beta-Lactamase Inhibitor That Extends the Antibacterial Spectrum of Beta-Lactams: Initial Bacteriological Characterization.

English, Arthur R., James A. Retsema, Arthur E. Girard, John E. Lynch, and Wayne E. Barth. CP-45,899, a Beta-Lactamase Inhibitor That Extends the Antibacterial Spectrum of Beta-Lactams: Initial Bacteriological Characterization. 1978.

English, Arthur R., et al. CP-45,899, a Beta-Lactamase Inhibitor That Extends the Antibacterial Spectrum of Beta-Lactams: Initial Bacteriological Characterization. 1978.