@book { EmpirischeundtheoretischeStudienzurEuropischenWhrungsunion,
    title = "Empirische und theoretische Studien zur Europäischen Währungsunion",
    author = "Bernd {Hayo}",
    year = "1998",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086301"
}