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    • An ecological systems conceptual framework for agricultural research and development. 

      Hart, R.D. (Iowa State University (EUA)CATIE - Centro Agronómico Tropical de Investigación y Enseñanza, 1979)
      The primary purpose of this paper is to describe a general agricultural systems conceptual framework that can serve as a starting point for a multidisciplinary team. A conceptual framework is a model, and like any model, ...
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