@online{ timsrc, author = "Botzenhart, Konrad", title = "Herausforderung Umwelt", publisher = "Universität Tübingen", year = "2001", month = "Nov", day = "06", url = "https://timms.uni-tuebingen.de:443/tp/UT_20011106_001_umwelt_0001", urldate = "2024-11-27" }