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41Cyhoeddwyd 1986Available for University of the Philippines Diliman via IEEE Xplore Digital Library . Click here to access
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44Cyhoeddwyd 1985Available for University of the Philippines - Diliman via EBSCOhost. Click here to access
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47Cyhoeddwyd 1983Available for University of the Philippines Diliman via ACM Digital Library . Click here to access
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