Ye, Fan, Paul J. Carlson, and Mike N. Jackson. “Use of High Intensity Reflective Sheeting in Lieu of External Lighting of Overhead Roadway Signs”. Transport 33, no. 2 (January 26, 2018): 437–445. Accessed February 23, 2025. https://btp.vilniustech.lt/index.php/Transport/article/view/177.