1. Simple assay and extraction of periplasmic penicillinase in E. coli;Choma;Canad. J. Microbiol.,1981
2. Das Antibiotikum Aztreonam: Untersuchungen zur plasmidbedingten Resistenzausbildung;Cullmann;Immun. Infekt.,1983
3. Nonspecific induction of β-lactamase in Enterobacter cloacae;Cullmann;J. Gen. Microbiol.,1984
4. The interaction of β-lactam compounds with chromosomally mediated enzymes: relations to the molecular structure;Cullmann;Chemotherapy,1985
5. Properties of an inducible β-lactamase from Proteus vulgaris;Cullmann;Zbl. Bakt. Hvg. A,1986