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- [6] CROSS-RESISTANCE TO FLUOROQUINOLONES IN MULTIPLE-ANTIBIOTIC-RESISTANT (MAR) ESCHERICHIA-COLI SELECTED BY TETRACYCLINE OR CHLORAMPHENICOL - DECREASED DRUG ACCUMULATION ASSOCIATED WITH MEMBRANE-CHANGES IN ADDITION TO OMPF REDUCTION ANTIMICROBIAL AGENTS AND CHEMOTHERAPY, 1989, 33 (08) : 1318 - 1325