@book { EUBulgaristikPerspektivenundPotenziale,
    title = "EU-Bulgaristik. Perspektiven und Potenziale",
    author = "Christian {Voss}",
    year = "2009",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b11908",
    url = "https://www.peterlang.com/document/1107493"
}