@book { SchuldnerverzugimspanischenZivilrecht,
    title = "Schuldnerverzug im spanischen Zivilrecht",
    author = "Gregor {Versondert}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091638"
}