@book { DieterEnnemosersC37TheorieundPraxis,
    title = "Dieter Ennemosers C37-Theorie (und -Praxis)",
    author = "David Alexander {Arroyabe}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096067"
}