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An absolute measurement of the neutral density profile in the tokamak plasma by resonance fluorescence on the Hα line, Razdobarin, G.T., Semenov, V.V., Sokolova, L.V., Folomkin, I.P., Burakov, V.S., Misakov, P.Ya., Naumenkov, P.A., Nechaev, S.V.
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Razdobarin et al. (1979) studied this question.
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