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  1. Calvert, W., et al., Reply to "Comment on 'The feasibility of radio sounding in the magnetosphere'", Radio Sci., 32 (1), 281-284, Jan.-Feb. 1997.
  2. Wurz, P., et al., Hydrogen and oxygen negative ion production by surface ionization using diamond surfaces, Surface Science, 373, 56, 1997.
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