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Kelley, M. C.; Farley, D. T.; Röttger, J.: The effect of cluster ions on anomalous VHF backscatter from the summer polar mesosphere. Geophysical Research Letters 14, pp. 1031 - 1034 (1987)

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McDiarmid, D. R.; Nielsen, E.: Stimultaneous observation of monochromatic and variable period geomagnetic pulsations. Journal Geophysical Research 92, p. 4445 (1987)

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