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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.221 KB) | DOI: 10.14238/pi21.1-2.1981.35-41
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (661.093 KB) | DOI: 10.14238/pi21.3-4.1981.81-9
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (584.046 KB) | DOI: 10.14238/pi22.5-6.1982.99-103
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14238/pi22.7-8.1982.126-31
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.508 KB) | DOI: 10.14238/pi22.9-10.1982.165-70