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References
Cassiday, G.L. et al. Phys. Rev. Lett. 62, 383–386 (1989).
Protheroe, R.J. Proc. 20th Int. Conf. Cosmic Rays 8, 21 (1987).
Dingus, B.L. et al. Phys. Rev. Lett. 60, 1785–1788 (1988).
Lamb, R.C. et al. Astrophys. J. 328, L13–L16 (1988).
Resvanis, L.K. et al. Astrophys. J. 328, L9–L12 (1988).
Dingus, B.L. et al. Phys. Rev. Lett. 61, 1906–1909 (1989).
Weeks, T.C. et al. Astrophys. J. (in the press).
Hillas, A.M. Proc. 19th Int. Conf. Cosmic Rays 9, 407 (1985).
Kazanas, D. & Ellison, D.C. Nature 319, 380 (1986).
Drees, M. & Halzen, F. Phys. Rev. Lett. 61, 275 (1988).
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Kazanas, D. Observations beyond the limit. Nature 338, 300 (1989). https://doi.org/10.1038/338300a0
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DOI: https://doi.org/10.1038/338300a0