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Morikawa, Yoshiro, Miyoshi Kitazato, Junichi Mitsuyama, Shingo Mizunaga, Shinzaburo Minami, and Yasuo Watanabe. In Vitro Activities of Piperacillin against β-Lactamase-Negative Ampicillin-Resistant Haemophilus Influenzae. American Society for Microbiology, 2004.

Morikawa, Yoshiro, et al. In Vitro Activities of Piperacillin against β-Lactamase-Negative Ampicillin-Resistant Haemophilus Influenzae. American Society for Microbiology, 2004.