Não informado. (1973). International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Oxford, Inglaterra: Pergamon Press, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon Press, 1973.
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