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3Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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4Published 2011Available for the University of the Philippines Diliman via SpringerLink. Click here to access
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7Published 2010Available for University of the Philippines Diliman via SpringerLink. Click here to access
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8Published 2006Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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