@book { SchtzundTestverfahreninderStichprobeninventur,
    title = "Schätz- und Testverfahren in der Stichprobeninventur",
    author = "Otto {Olbrich}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1081157"
}