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APA Citation
Unknown (2008). Lighting engineering : applied calculations. Place of publication not identified : Routledge. http://access.bl.uk/ark:/81055/vdc_100026696967.0x000001
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Unknown (2008). Lighting engineering : applied calculations. Place of publication not identified : Routledge. http://access.bl.uk/ark:/81055/vdc_100026696967.0x000001