1. Tables related to light scattering in a turbid atmosphere;de Bary;AFCRL-65-710(I), Special Report No. 33,1965
2. Contrast thresholds of the human eye;Blackwell;J. opt. Soc. Am.,1946
3. Monitoring the atmospheric aerosol parameters with the integrating nephelometer;Charlson;A P.C. A Jl,1969
4. A photoelectric method of measuring the atmospheric attenuation of brightness contrasts along a horizontal path for the visible region of the spectrum;Coleman;J. opt. Soc. Am.,1949
5. The visibility of distant objects;Duntley;J. opt. Soc. Am.,1948