@book { FrequenzallokationinderTelekommunikation,
    title = "Frequenzallokation in der Telekommunikation",
    author = "Stefan {Felder}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13932",
    url = "https://www.peterlang.com/document/1068480"
}