Daly, P. W. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Taylor, M. G. G. T., Friedel, R. H. W., Reeves, G. D., Dunlop, M. W., Fritz, T. A., Daly, P. W., et al. (2004). Multisatellite measurements of electron phase space density gradients in the Earth's inner and outer magnetosphere. Journal Geophysical Research, 109: A05220. doi:10.1029/2003JA010294.