@book { BedingungeneuropischerSolidaritt,
    title = "Bedingungen europäischer Solidarität",
    author = "Matthias Theodor {Vogt} and Jan {Sokol}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106531"
}