@online{
   timsrc,
   author = "Ninnemann, Helga AND Häfelinger, Günter",
   title = "Chemie an der Schwelle des 21. Jahrhunderts, Studium Generale, WiSe 1999/2000, 09.02.2000",
   publisher = "Universität Tübingen",
   year = "2000",
   month = "Feb",
   day = "09",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20000209_001_chemiering_0001",
   urldate = "2024-04-29"
}