@book{Graßl:1857,
      author        = "Graßl H. and Schubert R. and Epiney A. and Kulessa M. and
                       Luther J. and Nuscheler F. and Sauerborn R. and
                       Schellnhuber H.",
      title         = "{Fighting poverty through environmental policy}",
      publisher     = "Earthscan",
      year          = "2005",
}