1. Low precision formulae for the sun's coordinates and the equation of time;American Ephemeris and Nautical Almanac,1986
2. Comments on Calculating the position of the sun;Archer;Solar Energy,1980
3. What time does the sun rise and set?;Barkstrom;BYTE Mag.,1981
4. Geometric model simulations of conifer canopy reflectance. IIIe Colloque sur les signatures spectrales d'objets en teledetection;Cavayas,1985
5. Albedo of simulated surfaces related to roughness;Dickinson,1972