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3. Black, J.H. 1986, in Spectroscopy Qf Astrophysical Plasmas, eds. A. Dalgarno and D. Layzer (Cambridge University Press).
4. Brandt, J.C., and the HRS Investigation Definition and Experimental Development Teams, 1982, in The Space Telescope Observatory, ed. D.N.B. Hall, NASA CP-2244, p. 76.
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