References
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- . Sköld, O. & Widh, A.: A new dihydrofolate reductase with low trimethoprim sensitivity induced by an R factor mediating high resistance to trimethoprim. J Biol Chem 249: 4324, 1974.
- . Sköld, O.: R-factor-mediated resistance to sulfonamides by a plasmid-borne, drug-resistant dihydropteroate synthase. Antimicrob Agents Chemother 9: 49, 1976.