1. Abramowitz, M. and Stegun, I., Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, US Department of Commerce, National Bureau of Standards, 1972; Moscow: Nauka, 1979.
2. Afraimovich, E.L. and Perevalova, N.P., GPS-monitoring verkhnei atmosfery Zemli (GPS-Monitoring of the Earth’s Upper Atmosphere), Irkutsk: GU NTs RVKhV SNTs SO RAMN, 2006.
3. Afraimovich, E.L., Lesyuta, O.S., and Ushakov, I.I., Geomagnetic disturbances and operation of the GPS navigation system, Geomagn. Aeron. (Engl. Transl.), 2002, vol. 42, no. 2, pp. 208–215.
4. Afraimovich, E.L., Ishin, A.B., Tinin, M.V., Yasyukevich, Yu.V., and Jin, S.G., First evidence of anisotropy of GPS phase slips caused by the mid-latitude field-aligned ionospheric irregularities, Adv. Space Res., 2011, vol. 47, pp. 1674–1680.
5. Bassiri, S. and Hajj, G.A., Higher order ionospheric effects on global positioning system observables and means of modeling them, Manuscr. Geod., 1993, no. 18, pp. 280–289.