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Contribution to the COPERS symposium on “The Interplanetary Medium”, held in Paris on June 19, 1962.
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Blackwell, D.E. Remarks on the limitations of optical methods for measuring electron densities in the coronia and interplanetary space. Space Sci Rev 1, 612–614 (1963). https://doi.org/10.1007/BF00225275
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DOI: https://doi.org/10.1007/BF00225275