@book { TheWorldbehindtheWorld,
    title = "The World behind the World",
    author = "Josef {Vladár} and Egon {Wiedermann}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16583",
    url = "https://www.peterlang.com/document/1058530"
}