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Review/Citation: LAŠTOVIČKA, Jan. What is the optimum solar proxy for long-term ionospheric investigations? Advances in Space Research. 2021, 67(1), 2-8. ISSN 0273-1177. E-ISSN 1879-1948
Requested document: 0531706_AdvInSpPhys_Laštovička_2021.pdf - Publisher’s postprint
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