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1Published 2013Available for University of the Philippines System via SAGE Knowledge. Click here to access
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2Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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6Published 2011Available for University of the Philippine Diliman via Springerlink. Click here to access
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7Published 2011Available for University of the Philippine Diliman via Springerlink. Click here to access
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8Published 2007Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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