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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (519.047 KB) | DOI: 10.14238/pi31.9-10.1991.253-60
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (420.115 KB) | DOI: 10.14238/pi31.9-10.1991.261-7
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.091 KB) | DOI: 10.14238/pi31.9-10.1991.268-72
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.182 KB)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14238/pi20.11-12.1980.229-35