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2
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El Programa de apoyo ecológico (TÃB) : objetivos, concepción y criterios para la adjudicación / [red. Michaela Hammer, Stefanie EiÃing].
- GTZ,
- 2000.
- Eschborn :
-
Root interactions in agroforestry systems : quantification and management of root interactions between fast-growing timber trees and coffee in plantations in Costa Rica / Michaela Schaller.
- Deutsche Gesellschaft für technische Zusammenarbeit (GTZ),
- 2001.
- Eschborn :