1. International Telecommunication Union ITU‐R Recommendation “The radio refractive index: its formula and refractivity data ”pp.453–456 Geneva 1997.
2. International Telecommunication Union ITU‐R Recommendation “Effects of tropospheric refraction on radiowave propagation ”pp.834–842 Geneva 1997.
3. International Telecommunication Union ITU‐R Recommendation “Attenuation by hydrometeors in precipitation and other atmospheric particles ”Vol. 5 pp.721–723 Geneva 1990.
4. International Telecommunication Union ITU‐R Recommendation “Attenuation by atmospheric gases ”pp.676–683 Geneva 1997.