Lüdeke, M. K. B.; Badeck, F.-W.; Otto, R. D.; Häger, C.; Dönges, S.; Kindermann, J.; Würth,G.; Lang, T.; Jäkel, U.; Klaudius, A.; Ramge, P.; Habermehl, S.; Kohlmaier, G. H. (1994) The Frankfurt Biosphere  Model. A global process oriented model for the seasonal and longterm CO 2 exchange between terrestrial ecosystems and the atmosphere. Climate Research 4(2): 143-166.