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Ahrends, Hella E.; Etzold, Sophie; Kutsch, Werner L.; Stöckli, Reto; Brügger, Robert; Jeanneret, François; Buchmann, Nina; Eugster, Werner (2009). Tree phenology and carbon dioxide fluxes - use of digital photography for process-based interpretation at the ecosystem scale. Climate research, 39(3), pp. 261-274. Oldendorf (Luhe) (D): Inter-Research 10.3354/cr00811
