Haider SI, Johnell K, Thorslund M, Fastbom J (2007). «Trends in polypharmacy and potential drug-drug interactions across educational groups in elderly patients in Sweden for the period 1992 - 2002». International Journal of Clinical Pharmacology and Therapeutics. 45 (12): 643–653. PMID18184532.CS1-vedlikehold: Flere navn: forfatterliste (link)