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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. Available: https://www.sciencedirect.com/science/article/pii/S0273117721005032
Requested document: 0544605_ASR_Laštovička_2021.pdf - Publisher’s postprint
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