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International Reference Ionosphere, IRI 79 : report of URSI working group G.4 (identical with COSPAR task group on International Reference Ionosphere)
- "International Reference Ionosphere, I.R.I. 79"@en
- "International Reference Ionosphere, IRI 79 : report of URSI working group G.4 (identical with COSPAR task group on International Reference Ionosphere)"@en
- "International Reference Ionosphere, IRI 79 report of URSI working group G.4 (identical with COSPAR task group on International Reference Ionosphere)"@en
- "International Reference Ionosphere, IRI 79 report of URSI working group G.4 (identical with COSPAR task group on International Reference Ionosphere)"