Não informado. (1961). Basic Research Progress Report. Technical University of Denmark.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Basic Research Progress Report. Copenhagen: Technical University of Denmark, 1961.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Basic Research Progress Report. Technical University of Denmark, 1961.
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