Magnetometer array for cusp and cleft studies observations of the spatial extent of broadband ULF magnetic pulsations at cusp/cleft latitudes,
Engebretson, M. J., W. J. Hughes, J. L. Alford, E. Zesta, L. J. Cahill, R. L. Arnoldy, G. D. Reeves (1995),
J. Geophys. Res., 100 p. 19,371–19,386,
10.1029/95JA00768.