@book { UngarnsVerfassungvom25April2011, title = "Ungarns Verfassung vom 25. April 2011", subtitle = "Einführung – Übersetzung – Materialien", author = "Herbert {Küpper}", year = "2012", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-01616-1", url = "https://www.peterlang.com/document/1046092" }