@online{ timsrc, author = "Gellert, Olaf", title = "Zertifizierung im Internet", publisher = "Universität Tübingen", year = "2001", month = "Apr", day = "06", url = "https://timms.uni-tuebingen.de:443/tp/UT_20010406_001_bikgellert_0001", urldate = "2024-11-27" }