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1Julkaistu 2012Available for University of the Philippines System via SAGE Knowledge. Click here to access
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2Tekijä Rippe, James M.Available for University of the Philippines Baguio via SAGE Knowledge. Click here to access
Julkaistu 2012
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3Tekijä Pitkin, Mark R.Available for University of the Philippines Diliman via SpringerLink. Click here to access
Julkaistu 2011
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4Julkaistu 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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