Não informado. (1984). Issues in Science and Technology. National Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Issues in Science and Technology. Washington: National Academy of Sciences, 1984.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Issues in Science and Technology. National Academy of Sciences, 1984.
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