@online{ timsrc, author = "Kley, Wilhelm AND Werner, Klaus AND Wharam, David", title = "Streifzug durch die Astronomie, 15. und 16. Stunde", publisher = "Universität Tübingen", year = "2016", month = "Dec", day = "13", url = "https://timms.uni-tuebingen.de:443/tp/UT_20161213_001_rvastro_0001", urldate = "2024-03-28" }