Não informado. (1971). Euro abstracts. Commission of the European Communities.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Euro Abstracts. Luxembourg: Commission of the European Communities, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Euro Abstracts. Commission of the European Communities, 1971.
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