@online{
   timsrc,
   author = "Klumpp, Andreas",
   title = "Herausforderung Umwelt",
   publisher = "Universität Tübingen",
   year = "2002",
   month = "Jan",
   day = "15",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20020115_001_umwelt_0001",
   urldate = "2024-11-23"
}