@book { UmweltallokationimRaum,
    title = "Umweltallokation im Raum",
    author = "Horst {Siebert}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14109",
    url = "https://www.peterlang.com/document/1068634"
}