@incollection{Liedtke2004,
  author    = {Liedtke, Christa},
  title     = {Toward sustainable products and services},
  booktitle = {Eco-efficiency and beyond : towards the sustainable enterprise},
  editor    = {Seiler-Hausmann, Jan-Dirk},
  publisher = {Greenleaf},
  address   = {Sheffield},
  pages     = {123 -- 129},
  year      = {2004},
  language  = {en}
}