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24Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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27Published 2011Available for University of the Philippines System via SpringerLink. Click here to access
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32Published 2011Available for the University of the Philippines System via SAGE Knowledge. Click here to access
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36Published 2009Available for the University of the Philippines System via SAGE Knowledge. Click here to access
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40Published 2008Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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