@book { DierulesagainstperpetuitiesimdeutschenErbrecht,
    title = "Die «rules against perpetuities» im deutschen Erbrecht",
    author = "Bernhard {Hofmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108254"
}