@online{
   timsrc,
   author = "Grammig, Joachim",
   title = "Lecture Applied Econometrics, 28. Lesson",
   publisher = "Universität Tübingen",
   year = "2020",
   month = "Jun",
   day = "09",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20200609_002_appecono_0001",
   urldate = "2024-04-19"
}