@book { DieMehreheimErbrecht,
    title = "Die Mehrehe im Erbrecht",
    author = "Christian {Schäfer}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15351",
    url = "https://www.peterlang.com/document/1057844"
}