Não informado. Philips Research Reports. Philips Gloeilampenfabrieken, Research Laboratory.
Cita Chicago Style (17a ed.)Não informado. Philips Research Reports. Eindhoven, Holanda: Philips Gloeilampenfabrieken, Research Laboratory.
Cita MLA (8a ed.)Não informado. Philips Research Reports. Philips Gloeilampenfabrieken, Research Laboratory.
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