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Hannu Karttunen, Pekka Kröger, Heikki Oja, Markku Putanen, Karl J. Donner (Personal Name)
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Work cat.: (OSt)1611317: Hannu Karttunen, Pekka Kröger, Heikki Oja, Markku Putanen, Karl J. Donner, Fundamental Astronomy