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Review/Citation:  LAŠTOVIČKA, Jan. The best solar activity proxy for long-term ionospheric investigations. Advances in Space Research. 2021, 68(6), 2354-2360. ISSN 0273-1177. E-ISSN 1879-1948
Requested document:  0544605_ASR_Laštovička_2021.pdf - Publisher’s postprint
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