1. Aschwanden, M.J.: Space Sci. Rev. 171, 3–21 (2012)
2. Bieber, J.W., Clem, J., Evenson, P., et al.: In: Sripathi Acharya, B., Gupta, S., Jagadeesan, P., Jain, A., Karthikeyan, S., Morris, S., Tonwar, S. (eds.) 29th ICRC, Pune, vol. 1, pp. 237–240. Tata Institute of Fundamental Research, Mumbai (2005)
3. Bombardieri, D.J., Duldig, M.L., Humble, J.E., Michael, K.J.: Astrophys. J. 682, 1315–1327 (2008)
4. Bougeret, J.-L., Kaiser, M.L., Kellogg, P.J., et al.: Space Sci. Rev. 71, 231–263 (1995)
5. Cane, H.V., Erickson, W.C., Prestage, N.P.: J. Geophys. Res. 107, 1315 (2002)