@book { 20JahreMauerfall,
    title = "20 Jahre Mauerfall",
    author = "Marta {Fernández Bueno} and Torben {Lohmüller}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0353-3",
    url = "https://www.peterlang.com/document/1052177"
}