Dolfini JE, Applegate HE, Bach G, Basch H, Bernstein J, Schwartz J, Weisenborn FL (February 1971). "A new class of semisynthetic penicillins and cephalosporins derived from D-2-(1,4-cyclohexadienyl)glycine". Journal of Medicinal Chemistry. 14 (2): 117–9. doi:10.1021/jm00284a008. PMID5544394.
Dolfini JE, Applegate HE, Bach G, Basch H, Bernstein J, Schwartz J, Weisenborn FL (February 1971). "A new class of semisynthetic penicillins and cephalosporins derived from D-2-(1,4-cyclohexadienyl)glycine". Journal of Medicinal Chemistry. 14 (2): 117–9. doi:10.1021/jm00284a008. PMID5544394.