Popecki, M. A., Mazur, J. E., Möbius, E., Klecker, B., Bogdanov, A., Mason, G. M., & Kistler, L. M. (2003).
Observation of energy-dependent charge states in solar energetic particle events. In, Kajita, T., A., Y., Matsubara, Y., Sasaki,
&, M. (Eds.), 28th International Cosmic Ray Conference
- ICRC 2003 - (pp. 3283-3286). Tokyo: Universal Academy Press.