@book { DasSprbarkeitsmerkmaldesUWG2015,
    title = "Das Spürbarkeitsmerkmal des UWG 2015",
    author = "Katja {Middelhoff}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15644",
    url = "https://www.peterlang.com/document/1110809"
}