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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (530.766 KB) | DOI: 10.14238/pi21.7-8.1981.141-6
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (386.753 KB) | DOI: 10.14238/pi22.3-4.1982.65-9
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14238/pi22.9-10.1982.181-4