1. Alexander, J. K., Malitson, H. H. & Stone, R. G., 1969, Solar Phys., 8, 388
2. Aubier, M. G., Leblanc, Y. & Moller-Pederson, B., 1978, A&Ap, 70, 685
3. Bale, S. D. and Reiner, M. J. and Bougeret, J.-L. and Kaiser, M. L. and Krucker, S. and Larson, D. E. and Lin, R. P. 1999, GRL, 26, 1573
4. Boishot, A., de la Noe, J. & B. Moller-Pederson, 1970, A&Ap, 4, 159
5. Boischot, A., Riddle, A. C., Pearce. J. B., & Warwick, J. W., 1980, Solar Phys., 5, 397