@online{ timsrc, author = "Cederbaum, Carla", title = "Vorlesung Geometrie, 41. und 42. Stunde", publisher = "Universität Tübingen", year = "2023", month = "Jan", day = "13", url = "https://timms.uni-tuebingen.de:443/tp/UT_20230113_001_ws2223geomet_0001", urldate = "2024-12-21" }