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 G. P.  Robertson, et al., ?Long-term agricultural research (LTAR): A research, education, and extension imperative?, BioScience, vol. 58, p. 640-645, 2008.\par \par Biodiversity in Drylands: Toward a Unified Framework. 2004, p. 368.\par \par  M.  Shachak, J. R.  Gosz, A.  Perevolotsky, and S. T. A.  Pickett, ?Introduction: A framework for biodiversity studies?, in M. Shachak, J. Gosz, S. T. A. Pickett, and A.\'a0Perevolotsky (eds.). Biodiversity in Drylands: Toward a Unified Framework, 2004, p. 3-12.\par \par  M.  Shachak, S. T. A.  Pickett, and J. R.  Gosz, ?Plant species diversity and ecosystem processes in water limited systems?, in M. Shachak, J. Gosz, S. T. A. Pickett, and A.\'a0Perevolotsky (eds.). Biodiversity in Drylands: Toward a Unified Framework, 2004, p. 153-166.\par \par  M.  Shachak, J. R.  Gosz, A.  Perevolotsky, and S. T. A.  Pickett, ?Toward a unified framework in biodiversity studies?, in M. Shachak, J. Gosz, S. T. A. Pickett, and A.\'a0Perevolotsky (eds.). Biodiversity in Drylands: Toward a Unified Framework, 2004, p. 320-336.\par \par  S. T. A.  Pickett, et al., ?Integrated models of forested regions?, in P. Groffman and G. E. Likens (eds.). Integrated Regional Models: Interactions Between Humans and Their Environment, 1994, p. 120-141.\par \par }