1. PS-5, a new β-lactam antibiotic;Okamura,1979
2. PS-6 and PS-7, new β-lactam antibiotics;Shibamoto,1980
3. PS-8, a minor carbapenem antibiotic;Shibamoto;J. Antibiot.,1982
4. Epithienamycins—Novel β-lactams related to thienamycin;Stapley,1981
5. Olivanic acid, a family of β-lactam antibiotics with β-lactamase inhibitory properties produced by Streptomyces species;Butterworth,1979