TY  - RPRT
TI  - Structure-activity relations and beta-lactamase resistance.
AU  - C H O'Callaghan
PY  - 1980
DO  - 10.1098/rstb.1980.0038
UR  - https://pubmed.ncbi.nlm.nih.gov/6109316/
ID  - 6109316
ER  -