共 7 条
[2]
BUTTENWORTH D, Patent No. 1467413
[3]
DEMARCO PV, 1972, CEPHALOSPORINS PENIC, P311
[4]
HOWARTH TT, 1976, J CHEM SOC CHEM COMM, P266
[5]
KAHAN JS, Patent No. 3950357
[7]
1976, 16TH INT C ANT AG CH