@online{ timsrc, author = "Lubich, Christian", title = "Vorlesung Numerik, 21. Stunde", publisher = "Universität Tübingen", year = "2020", month = "Dec", day = "17", url = "https://timms.uni-tuebingen.de:443/tp/UT_20201217_001_ws2021numerik_0001", urldate = "2024-12-26" }