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31Published 1989Available for University of the Philippines Diliman via SpringerLink . Click here to access
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33Published 1985Available for University of the Philippines Diliman via SpringerLink . Click here to access
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34Published 1983Available for University of the Philippines Diliman via SpringerLink . Click here to access
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35
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36Published 1982Available for University of the Philippines Diliman via SpringerLink . Click here to access
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37Published 1979Available for University of the Philippines Diliman via SpringerLink . Click here to access
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38
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39Published 1977Available for University of the Philippines Diliman via SpringerLink . Click here to access
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40