@book { ffentlichePlanungaufLandesebene,
    title = "Öffentliche Planung auf Landesebene",
    author = "Eberhard {Wille}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14091",
    url = "https://www.peterlang.com/document/1068622"
}