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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1243.159 KB) | DOI: 10.14238/pi21.7-8.1981.147-160
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1150.027 KB) | DOI: 10.14238/pi21.9-10.1981.181-91
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14238/pi22.1-2.1982.1-10