Reference

Search for REF=[803].

803
Higgens, C. E. and Kastner, R. E.
Streptomyces clavuligerus sp. nov., a β-lactam antibiotic producer.
Int. J. Syst. Bacteriol. 21: 326-331, 1971.
DOI: 10.1099/00207713-21-4-326.