@online{
   timsrc,
   author = "Kramer, Michael",
   title = "Einsteins Universum und seine Botschafter",
   publisher = "Universität Tübingen",
   year = "2013",
   month = "May",
   day = "16",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20130516_001_rvall_0001",
   urldate = "2024-05-18"
}