1. Bason F. (1997) A filter radiometer for the measurements of sky radiance. In North Sun ’97, Solar Energy at High Latitudes, Helsinki, Finland, 9–11 June.
2. CIE (1994) Guide to Recommended Practice of Daylight Measurements. CIE 108-1994, ISBN 3 900 734 50X.
3. Trübungsfactor, precipitable water. Staub;Feussner;Gerlands Beitr. Geophys.,1930
4. A spectral model of Linke’s turbidity factor and its experimental implications;Grenier;Solar Energy,1994
5. Atmospheric turbidity analyzed by means of standardized Linke’s turbidity factor;Grenier;J. Appl. Meteo.,1995