1. Budden K G. Radio Waves in the Ionosphere. Cambridge: Cambridge University Press, 2009. 5
2. Reinisch B W, Galkin I A, Khmyrov G M, et al. New digisonde for research and monitoring applications. Radio Sci, 2009, 44: RS0A24
3. Hao Y Q, Zhang D H. Ionospheric absorption and planetary wave activity in East Asia sector. Sci China Tech Sci, 2012, 55: 1264–1272
4. Lynn K J M. Oblique sounding in Australia. http://ips.gov.au/IPSHosted/ , 2008
5. Kim A G, Ratovsky K G, Khakhinov V V, et al. The project of monitoring the ionosphere over Russian Federation by means of digital FMCW ionosondes network. In: URSI General Assembly and Scientific Symposium of International Union of Radio Science. Istanbul: URSI, 2011. G 04–6