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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.763 KB) | DOI: 10.14238/pi33.5-6.1993.95-9
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (623.161 KB) | DOI: 10.14238/pi31.9-10.1991.273-80
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (587.915 KB) | DOI: 10.14238/pi28.11-12.1988.238-49
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14238/pi20.7-8.1980.169-76