@online{ timsrc, author = "Hiller, Wolfgang", title = "Symmetrie in Wissenschaft und Kunst I - Symmetrie bei Kristallstrukturen", publisher = "Universität Tübingen", year = "2001", month = "Dec", day = "03", url = "https://timms.uni-tuebingen.de:443/tp/UT_20011203_001_symmetrie_0001", urldate = "2024-12-03" }