@book { DieVerwaltunginPrivatrechtsforminSpanienundDeutschland,
    title = "Die Verwaltung in Privatrechtsform in Spanien und Deutschland",
    author = "Santiago {Gonzalez-Varas}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094999"
}