@book { LeMurdeBerlin,
    title = "Le Mur de Berlin",
    author = "Nicole {Colin} and Corine {Defrance} and Ulrich {Pfeil} and Joachim {Umlauf}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b10534",
    url = "https://www.peterlang.com/document/1113785"
}