@online{ timsrc, author = "Keppeler, Stefan", title = "Vorlesung Mathematik 1 für Naturwissenschaftler, 21. Stunde", publisher = "Universität Tübingen", year = "2017", month = "Nov", day = "29", url = "https://timms.uni-tuebingen.de:443/tp/UT_20171129_001_mathnat1_0001", urldate = "2024-11-21" }