@book { SonderkontrollederVertragsstrafe,
    title = "Sonderkontrolle der Vertragsstrafe",
    author = "Yanfei {Zeng}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06203-8",
    url = "https://www.peterlang.com/document/1049688"
}