@book { HimmelaufErdenHeavenonEarth,
    title = "Himmel auf Erden – Heaven on Earth",
    author = "Rudolf {Suntrup} and Jan R. {Veenstra}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00722-0",
    url = "https://www.peterlang.com/document/1053641"
}