@book { BehindtheIronCurtain,
    title = "Behind the Iron Curtain",
    author = "Tõnu {Tannberg}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06082-9",
    url = "https://www.peterlang.com/document/1049813"
}