1. European Commission, "A strategy for smart, sustainable and inclusive growth EUROPE 2020", (http://ec.europa.eu/europe2020/) [retrieved Apr. 7, 2015]. Google Scholar
2. Freeman, R. L., Radio System Design for Telecommunications, 3rd Edition, Wiley-Interscience, New York, 2007. Google Scholar
3. Maral, G. and M. Bousquet, Satellite Communications Systems — Systems, Techniques and Technology, 5th Edition, John Wiley & Sons Ltd., 2009. Google Scholar
4. Information about 4G WiMAX services in Lithuania "Mezon", http://www.mezon.lt/ Apie MEZON/Technologija/ [retrieved Apr. 7, 2015]. Google Scholar
5. Ali, S., S. A. Malik, K. S. Alimgeer, S. A. Khan, and R. L. Ali, "Statistical estimation of tropospheric radio refractivity derived from 10 years meteorological data," Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 77, 96-103, 2012.
doi:10.1016/j.jastp.2011.12.001 Google Scholar
6. Okoro, O. N., G. A. Agbo, J. E. Ekpe, and T. N. Obiekezie, "Comparison of hourly variations of radio refractivity for quiet and disturbed days during dry and rainy seasons at Minna," International Journal of Basic and Applied Sciences, Vol. 2, No. 1, 58-63, 2013.
doi:10.14419/ijbas.v2i1.541 Google Scholar
7. Agbo, G. A., "Tropospheric refractivity dependence on atmospheric weather conditions in Jos-Nigeria," Journal of Basic Physical Research, Vol. 2, No. 2, 1-6, 2011. Google Scholar
8. "The radio refractive index: Its formula and refractivity data", 45310, Recommendation ITU-R P.45310 (Feb. 2012). Google Scholar
9. Olasoji, Y. O. and M. O. Kolawole, "Seasonal effect on atmospheric refractivity in diverse terrains," Journal of Environmental Science and Engineering, Vol. 5, 1537-1541, 2011. Google Scholar
10. Adediji, A. T. and M. O. Ajewole, "Variation of radio refractivity gradient and effective Earth radius factor (k factor) over Akure, South Western Nigeria," URSI General Assembly and Scientific Symposium of International Union of Radio Science, August 2011. Google Scholar
11. Bean, B. and E. Dutton, Radio Meteorology, Dover Publications, 1968. Google Scholar
12. Li, J., L.-X. Guo, L.-K. Lin, Y. Zhao, Z. Zhao, T. Shu, and H. Han, "A dual-frequency method of eliminating liquid water radiation to remotely sense cloudy atmosphere by ground based microwave radiometer," Progress In Electromagnetics Research, Vol. 138, 629-645, 2013.
doi:10.2528/pier13010201 Google Scholar
13. Zilinskas, M., S. Tamosiunas, M. Tamosiunaite, and M. Tamosiuniene, "Yearly, seasonal and daily variations of radio refractivity," Acta Physica Polonica A, Vol. 119, No. 4, 533-536, 2011. Google Scholar
14. Zilinskas, M., M. Tamosiunaite, S. Tamosiunas, E. Brilius, and M. Tamosiuniene, "Model for determination of territorial distribution of surface radio refractivity," PIERS Proceedings, Stockholm, Sweden, August 12-15, 2013. Google Scholar
15. Sauter, M., From GSM to LTE — An Introduction to Mobile Networks and Mobile Broadband, John Wiley & Sons, 2011. Google Scholar
16. Ikeda, Y., K. Okada, S. Kitagawa, S. Suzuki, and M. Asada, "Resonant-tunneling-diode oscillator with high-frequency modulation structure for high-capacity terahertz communication," 2014 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMWTHz), 1-2, Tucson, AZ, September 14-19, 2014. Google Scholar