@book { OperationalAssessmentofMonetaryPovertybyProxyMeansTests,
    title = "Operational Assessment of Monetary Poverty by Proxy Means Tests",
    author = "Julia {Johannsen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107377"
}