@book { UrteilstatbestandundMndlichkeitsprinzip,
    title = "Urteilstatbestand und Mündlichkeitsprinzip",
    author = "Reinhard {Gaier}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088351"
}