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MLA-Zitierstil (9. Ausg.)Enlarged Space and Ground Data Base for Ionospheric Modelling: Proceedings of the Topical Meeting of the COSPAR Interdisciplinary Scientific Commission C (meeting C5) of the COSPAR Twenty-eighth Plenary Meeting Held in The Hague, the Netherlands, 25 June - 6 July 1990. Pergamon Press, 1991.