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3Publicerad 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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4Publicerad 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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7Publicerad 1998Available for University of the Philippines Diliman via Wiley Online Library. Click here to access
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8Publicerad 1998Available for University of the Philippines Baguio via Wiley Online Library. Click here to access
Electronic Resource