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1Published 2017Available for University of the Philippines Baguio via Cambridge Core eBooks. Click here to access
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5Published 2011Available 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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9Published 2006Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
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