Não informado. Soviet-bloc research in geophysics, astronomy ans space. Joint Publications Research Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Arlington, Wash: Joint Publications Research Service.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Joint Publications Research Service.
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