Kirsch, E., Keppler, E., Witte, M., Rosenbauer, H., Livi, S., Schwingenschuh, K., McKenna-Lawlor, S. M. P., Afonin, V. V., O'Sullivan, D., & Thompson, A. (1991). Pick-up ions (Eo+ > 55 keV) measured near Mars by Phobos-2 in February/March 1989. Annales Geophysicae, 9, 761-767.