J. Scheer, K. Bruning, T. Frohlich, P. Wurz, and W. Heiland. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 157 (1-4):
208--213(August 1999)
D. McComas, F. Allegrini, L. Bartolone, and et al.. Solar Wind 11/SOHO 16, Connecting Sun and Heliosphere, volume 592 of ESA Special Publication, (September 2005)