1. Recommendation ITU-R P.1621-2 “Propagation data required for the design of Earth-space systems operating between 20 THz and 375 THz”. International Telecommunication Union, radiocommunication sector.
2. Recommendation ITU-R P.676-12 “Attenuation by atmospheric gases and related effects”. International Telecommunication Union, radiocommunication sector.
3. The Refraction Correction of Elevation Angle for the Mean Annual Global Reference Atmosphere
4. Multiple-wavelength free-space laser communications
5. Astrophysical quantities.;Allen,1973