Não informado. Philips Research Reports. Philips Research Laboratories.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Philips Research Reports. Eindhoven, Holanda: Philips Research Laboratories.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Philips Research Reports. Philips Research Laboratories.
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