1. Bieber, J. W., Burger, R. A., and Matthaeus, W. H.: 1995, Proc. Int. Conf. Cosmic Ray 24th, SH, 694
2. Christian, E. R., Cummings, A. C., and Stone, E. C.: 1988, Astrophys. J. Lett., 334, L77
3. Christian, E. R., Cummings, A. C., and Stone, E. C.: 1995, Astrophys. J. Lett., 446, L105
4. Cummings, A. C., and Stone, E. C.: 1987, Proc. Int. Conf. Cosmic Ray 20th, 3, 413
5. Cummings, A. C., and Stone, E. C.: 1988, Proc. Sixth Internat. Solar Wind Conference (Boulder), NCAR Technical Note 06 2, 599