Não informado. (1960). NEC Research and Development. Nippon Electric Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. NEC Research and Development. Tokyo: Nippon Electric Company, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. NEC Research and Development. Nippon Electric Company, 1960.
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