@online{ timsrc, author = "Kohler, Wilhelm", title = "Lecture Advanced Microeconomics, 20. and 21. Lesson", publisher = "Universität Tübingen", year = "2021", month = "Dec", day = "02", url = "https://timms.uni-tuebingen.de:443/tp/UT_20211202_001_ws2022advmicroeco_0001", urldate = "2024-11-23" }