Comparative in vitro activity of ampicillin, cefoperazone and their combinations with sulbactam, as well as that of other antibiotics against anaerobic organisms | Sravnitel'naia aktivnost' in vitro ampitsillina, tsefoperazona, ikh kombinatsiǐ s sul'baktamamom i drukikh antibiotikov v otnoshenii anaérobykh mikroorganizmov.