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2. 18) Peter R. Boyce : Human Factorsin Lighting 3rd Edition, CRC Press, pp. 129-131, 2014.4
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4. 25) Yoko Kato, Yoshiki Nakamura Yumi Kamiguchi and Michico Iwata : Study on Visibility Threshold Curve of Circular Objects and Visibility Estimation Method Using C-A Graph, Proceedings of the Conference on Smarter Lighting for Better Life at the CIE Midterm Meeting 2017 (KR), pp. 892-901, 2017.9