@article{Weizsaecker1994,
  author    = {Weizs{\"a}cker, Ernst U. von},
  title     = {{\"O}kologie : Herausforderung f{\"u}r die Wissenschaft},
  journal   = {Copernicus},
  pages     = {4 -- 5},
  year      = {1994},
  language  = {de}
}