@online{ timsrc, author = "Paravicini, Walther", title = "Vorlesung Geometrie, 18. Stunde", publisher = "Universität Tübingen", year = "2023", month = "Nov", day = "14", url = "https://timms.uni-tuebingen.de:443/tp/UT_20231114_002_ws2324geomet_0001", urldate = "2024-11-21" }