1. Efimov, A.I., Chashei, I.V., Shishov, V.I., and Yakovlev, O.I., Solar Wind Acceleration according to the Radio Sounding Data, Kosm. Issled., 1990, vol. 28, no. 4, pp. 581–586.
2. Efimov, A.I., Samoznaev, L.N., Andreev, V.E., Chashei, I.V., Bird, M.K., Vohlmuth, R., Edenhofer, P., and Plettemeier, D., The Outer Scale of Solar-Wind Turbulence from GALILEO Coronal-Sounding Data, Astron. Zh., 2002, vol. 79, no. 7, pp. 640–652 [Astron. Rep. (Engl. Transl.), 2992, vol. 46, no. 7, pp. 579–590].
3. Efimov, A.I., Armand, N.A., Lukanina, L.A., Samoznaev, L.N., Chashei, I.V., Bird, M.K., and Plettemeier, D., Radial Dependence of the Level of Amplitude Fluctuations of Spacecraft Signals Probing Circumsolar Plasma, Radiotekh. Electron., 2008, vol. 53, no. 10 [J. Commun. Technol. Electron. (Engl. Transl.), 2008, vol. 53, no. 10, pp. 1186–1194].
4. Gapper, G.R., Hewish, A., Purvis, A., and Duffett-Smith, P.J., Observing Interplanetary Disturbances from the Ground, Nature, 1982, vol. 296, no. 4, pp. 633–636.
5. Janaradhan, P., Bakasubramanian, V., Ananthakrishnan, S., Dryer, M., Bhatnagar, A., and McIntosh, P.S., Traveling Interplanetary Disturbances Detected Using Interplanetary Scintillation at 327 MHz, Sol. Phys., 1996, vol. 166, no. 7, pp. 379–401.