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Jahnke, Hans E. ,  [Quantitative indications for priorities in international agricultural research] ,  Quantitative indications for priorities in international agricultural research

Jahnke, Hans E. ,  [Systems research, systems simulation and ILCA's research on livestock production systems] ,  Systems research, systems simulation and ILCA's research on livestock production systems

Jahnke, Hans E. ,  [The contribution of economics to ILCA's interdisciplinary research. A tentative outline] ,  The contribution of economics to ILCA's interdisciplinary research. A tentative outline