@online{
   timsrc,
   author = "Zeller, Klaus-Peter AND Häfelinger, Günter",
   title = "Hypericin - ein Beitrag zur Chemie des Johanniskrauts",
   publisher = "Universität Tübingen",
   year = "2000",
   month = "Dec",
   day = "04",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20001204_001_rvchemie_0001",
   urldate = "2024-04-29"
}