Klecker, B. Space Plasma Physics of Near-Earth Environment, MPI for Extraterrestrial Physics, Max Planck Society;
Giang, T. T., Hamrin, M., Yamauchi, M., Lundin, R., Nilsson, H., Ebihara, Y., et al. (2009). Outflowing protons and heavy ions as a source for the sub-keV ring current. Annales Geophysicae, 27(2), 839-849.