MacDonald, E. A.; Funsten, H. O.; Dors, E. E.; Thomsen, M. F.; Janzen, P. H.; Skoug, R. M.; Reeves, G. D.; Steinberg, J. T.; Harper, R. (2009-06-01). "New Magnetospheric Ion Composition Measurement Techniques". American Institute of Physics Conference Series. 1144 (1): 168–172. Bibcode:2009AIPC.1144..168M. doi:10.1063/1.3169283.
MacDonald, E. A.; Funsten, H. O.; Dors, E. E.; Thomsen, M. F.; Janzen, P. H.; Skoug, R. M.; Reeves, G. D.; Steinberg, J. T.; Harper, R. (2009-06-01). "New Magnetospheric Ion Composition Measurement Techniques". American Institute of Physics Conference Series. 1144 (1): 168–172. Bibcode:2009AIPC.1144..168M. doi:10.1063/1.3169283.