1. 1
    Udgivet 2005
    ...National Library,...
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  2. 2
    Udgivet 2010
    ...La Trobe University Library,...
    Full text available from 2009 to present
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  3. 3
    Udgivet 1989
    ...British Library Document Supply Centre,...
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  4. 4
    Udgivet 2000
    ...NCBI, U.S. National Library of Medicine, NIH, Dept. of Health and Human Services,...
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