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3Published 2012Available for the University of the Philippines System via Oxford scholarship online. Click here to access
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4Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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7Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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9Published 2008Available for University of the Philippines System via Science Direct. Also available remotely thru Open Athens:
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