1. Berry, R. & Burnell, J. 2000, The Handbook of Astronomical Image Processing (Richmond: Willmann-Bell)
2. CIE (Commission Internationale de l'Eclairage). 1926, Compte Rendu, Sixth Session (Cambridge: Cambridge Univ. Press)
3. CIE (Commission Internationale de l'Eclairage). 1964, Compte Rendu, 1963 Session, Bureau Centrale (Paris: CIE)
4. Night sky brightness at sites from DMSP-OLS satellite measurements