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Brown RF, Kinnick MD, Morin JM, Vasileff RT, Counter FT, Davidson EO, et al. (August 1990). "Synthesis and biological evaluation of a series of parenteral 3'-quaternary ammonium cephalosporins". Journal of Medicinal Chemistry. 33 (8): 2114–21. doi:10.1021/jm00170a011. PMID2115587.