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@article{34072, author = "Kukkamäki, T. J. and Hytönen, Erkki and XII Assemblée Génerale de l'UGGI a Helsinki, 1960", title = "Two hundret - meter pendulum. Presented at the XII General Assembly of the IUGG 1960 in Helsinki by ", year = "1960", note = "1 sv.", }