@book { DasTestamentimgyptischenErbrecht,
    title = "Das Testament im ägyptischen Erbrecht",
    author = "Achim {Umstätter}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1089812"
}