1. Richardson, I., Cane, H., Von Rosenvinge, T., Mcguire, R.: IMP-8 GME energetic particle observations over three solar cycles. In: Proceedings of the 30th International Cosmic Ray Conference, vol. 1. Merida, Mexico, pp. 323–326 (2008)
2. George, J.S., Lave, K.A., Wiedenbeck, M.E., Binns, W.R., Cummings, A.C.: Elemental composition and energy spectra of galactic cosmic rays during solar cycle 23. Astrophys. J. 698(2), 1666–1681 (2009)
3. Kühl, P., Gómez-Herrero, R., Heber, B.: Annual cosmic ray spectra from 250 MeV up to 1.6 GeV from 1995–2014 measured with the electron proton helium instrument onboard SOHO. Solar Phys. 291, 965–974 (2016)
4. McKibben, R.B., Connell, J.J., Lopate, C., Zhang, M., Heber, B.: Intensities of galactic cosmic ray nuclei from the ecliptic to the south solar polar regions near solar maximum: observations from the ULYSSES COSPIN high energy telescope. In: Proceedings of the 27th International Cosmic Ray Conference, vol. 1. Hamburg, pp. 3893–3896 (2001)
5. Adriani, O., Barbarino, G.C., Bazilevskaya, G.A., Bellotti, R., Boezio, M., Bogomolov, E.A.: Time dependence of the proton flux measured by PAMELA during the 2006 July–2009 December solar minimum. Astrophys. J. 765(2), 91–98 (2013)