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Esper, Jan; Niederer, R; Luterbacher, Jürg; Büntgen, Ulf; Frank, David (2008). Calibration trails using very long instrumental and proxy data. In: Elferts, Didzis; Brumelis, Guntis; Gärtner, Holger; Helle, Gerd; Schleser, Gerhard (eds.) Sixth TRACE Tree rings in archaeology, climatology, and ecology. Proceedings of the Dendrosymposium 2007, May 3rd-6th 2007, Riga, Latvia. Scientific Technical Report STR: Vol. 08/05 (pp. 54-60). Potsdam: Deutsches Geoforschungszentrum 10.2312/GFZ.b103-08056
