@online{
   timsrc,
   author = "Werner, Klaus AND Nagel, Thorsten",
   title = "Vorlesung Einführung in die Astronomie I, 7. Stunde",
   publisher = "Universität Tübingen",
   year = "2008",
   month = "Nov",
   day = "26",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20081126_001_astro1_0001",
   urldate = "2024-04-23"
}