@online{
   timsrc,
   author = "Kramer, Peter",
   title = "Symmetrie in Wissenschaft und Kunst I - Symmetrie im Raum",
   publisher = "Universität Tübingen",
   year = "2001",
   month = "Nov",
   day = "26",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20011126_001_symmetrie_0001",
   urldate = "2024-05-05"
}