@online{ timsrc, author = "Grupe, Ommo", title = "O-Cup", publisher = "Universität Tübingen", year = "1999", month = "Jan", day = "01", url = "https://timms.uni-tuebingen.de:443/tp/UT_19990101_001_ocup_0001", urldate = "2024-11-24" }