REFERENCES (APPENDIX B) 1. F.W. Perkins and E. J. Valeo, Phys. Rev. Lett. 32, 1234 (1974). 2. G. D. Thome and F.W. Perkins, Phys. Rev. Lett. 32, 1238 (1974). 3. For example, see the special issue of Radio Science on Ionospheric Modification (November 1974).
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