@online{ timsrc, author = "Witzel, Walter", title = "Energienutzung und Klimawandel", publisher = "Universität Tübingen", year = "2007", month = "Jul", day = "03", url = "https://timms.uni-tuebingen.de:443/tp/UT_20070703_001_rvklima_0001", urldate = "2024-11-23" }