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Zahl PH, Mæhlen J.Zahl PH, et al.Tidsskr Nor Laegeforen. 2012 Feb 21;132(4):414-7. doi: 10.4045/tidsskr.11.0195.Tidsskr Nor Laegeforen. 2012.PMID: 22353833Free article.English, Norwegian.
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Strand BH, Zahl PH.Strand BH, et al. Among authors: zahl ph.Tidsskr Nor Laegeforen. 2001 Aug 30;121(20):2390-2.Tidsskr Nor Laegeforen. 2001.PMID: 11603048Free article.Norwegian.
Zahl PH, Strand BH.Zahl PH, et al.Tidsskr Nor Laegeforen. 2002 Feb 20;122(5):551; author reply 551.Tidsskr Nor Laegeforen. 2002.PMID: 11961987Free article.Norwegian.No abstract available.