Não informado. (1957). Bulletin of the Academy of Sciences of the USSR. American Geophysical Union.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Academy of Sciences of the USSR. New York: American Geophysical Union, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Academy of Sciences of the USSR. American Geophysical Union, 1957.
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