@book { FreundvonHeineMarxEngelsundLincoln,
    title = "Freund von Heine, Marx/Engels und Lincoln",
    author = "Marianne {Hirsch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095003"
}