@book { TheHiddenUnity,
    title = "The Hidden Unity",
    author = "Jarmila {Doubravova}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04794-3",
    url = "https://www.peterlang.com/document/1048755"
}