@book { JochenKlepper,
    title = "Jochen Klepper",
    subtitle = "Contribution à l'étude de l'émigration intérieure",
    author = "Gérard {Imhoff}",
    year = "1983",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071159"
}