@book { VorzugsaktieundKGaA,
    title = "Vorzugsaktie und KGaA",
    author = "Jan {Winzen}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04108-8",
    url = "https://www.peterlang.com/document/1048349"
}