K. K. Khurana1,
M. G. Kivelson1,2,
C. T. Russell1,2,
R. J. Walker1,
and D. J. Southwood3
1. Institute of Geophysics and Planetary Physics
University of California, Los Angeles
2. Department of Earth and Space Sciences
University of California, Los Angeles
3. Department of Physics, Imperial College of Science,
Technology, and Medicine, London
Nature, Vol. 387, pp. 262-264, May 15, 1997
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