Tsuyoshi Sugawara
- Maintenance Factor in Installation of Tunnel Lighting. In: Journal of the Illuminating Engineering Institute of Japan, v. 96, n. 2 ( 2012). (2012):
- トンネル照明における総視認率の検討 (第二報). Total revealing power of the tunnel interior lighting. In: Journal of the Illuminating Engineering Institute of Japan, v. 87 ( 2003). (2003):