@book { DerinternationaleVertragsschlu,
    title = "Der internationale Vertragsschluß",
    subtitle = "Ein Vergleich von UN-Kaufrecht, UNIDROIT-Principles und Principles of European Contract Law",
    author = "Eva {Luig}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095736"
}