Paschmann, G. Space Plasma Physics of Near-Earth Environment, MPI for Extraterrestrial Physics, Max Planck Society;
Matsui, H., Quinn, J. M., Torbert, R. B., Jordanova, V. K., Baumjohann, W., Puhl-Quinn, P. A., et al. (2003). Electric field measurements in the inner magnetosphere by Cluster EDI. Journal of Geophysical Research A, 108(9): 1352. doi:10.1029/2002JA009913.