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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
Ahrends, Hella Ellen; Brügger, Robert; Stöckli, Reto; Schenk, Jürg; Michna, Pavel; Jeanneret, Francois; Wanner, Heinz; Eugster, Werner (2008). Quantitative phenological observations of a mixed beech forest in northern Switzerland with digital photography. Journal of geophysical research, 113(G4) Washington, D.C.: American Geophysical Union 10.1029/2007JG000650
