@online{ timsrc, author = "Kohler, Wilhelm", title = "Lecture Advanced Microeconomics, 9. Lesson", publisher = "Universität Tübingen", year = "2021", month = "Nov", day = "04", url = "https://timms.uni-tuebingen.de:443/tp/UT_20211104_001_ws2022advmicroeco_0001", urldate = "2024-11-04" }