A statistical study of Pc 3–5 pulsations observed by the AMPTE/CCE Magnetic Fields Experiment, 1. Occurrence distributions,
Anderson, B. J., M. J. Engebretson, S. P. Rounds, et al. (1990),
JGR: Space Physics, 95, A7 p. 10249–10723,
10.1029/JA095iA07p10495.