References
- Boëthius G, Wiman F. Recording of drug prescriptions in the county of Jämtland, Sweden. I. Methodological aspects. Eur J Clin Pharmacol 1977; 12: 31–35
- Tennhammar-Ekman B, Sköld O. Trimethoprim resistance plasmids of different origin encode different drug-resistant dihydrofolate reductases. Plasmid 1979; 2: 334–346
- Svensk läkemedelsstatistik. National Corporation of Swedish Pharmacies, Published yearly by the (Apoteksbolaget)