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Published 2009
Full text available in DOAJ: Directory of Open Access Journals: 2009 to present
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Published 2008
Full text available in DOAJ: Directory of Open Access Journals: 2008 to present
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Published 1979
Full text available in DOAJ: Directory of Open Access Journals: 2012 to present
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Published 2010
Full text available in DOAJ: Directory of Open Access Journals: 2010 to present
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Published 1978
Full text available in DOAJ: Directory of Open Access Journals: 2015 to present
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Published 1996
Full text available in DOAJ: Directory of Open Access Journals: 2016 to present
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Published 1952
Full text available in DOAJ: Directory of Open Access Journals: 2001 to present
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