Schellnhuber, H. J., Kokott, J., Beese, F. O., Fraedrich, K., Klememr, P., Kruse-Graumann, L., Neumann, C., Renn, O., Schulze, E.-D., Tilzer, M., Velsinger, P., Zimmermann, H.(2001): World in transition: Conservation and sustainable use of the biosphere, (World in transition: Conservation and sustainable use of the biosphere), London : Earthscan.