1. An Analytic Model for Describing the Influence of Lighting Parameters Upon Visual Performance, CIE Report No. 19–2 (1980).
2. Visibility and Research Subcommittee of Roadway Lighting Committee of IES internal report, unpublished.
3. Keck M. E., Private Conversation.
4. Recommendations for the Lighting of Roads for Motorized Traffic, CIE Report No. 12–2 (1977).