Não informado. (1959). Bulletin of the Operations Research Society of America. Operations Research Society of America.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Operations Research Society of America. Baltimore, Md: Operations Research Society of America, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Operations Research Society of America. Operations Research Society of America, 1959.
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