1. Doc 9157-AN/901 (2004) ICAO aerodrome design guide. 4. Visual aids, 4th ed
2. Doc 9157 (2017) Part 5—Electrical systems, Aerodrome design manual, pp 226
3. CIE—Publication (1971) Colorimetry, 15
4. ISO/CIE 11664-4: (2019) (E) Colorimetry. Part 4. CIE color space 1976 L * a * b *
5. Doc 9328-AN/908 ICAO (2005) A guide to the practice of tracking and reporting on visibility observation to runways, 3rd ed., pp 124