@book { ApplicationofMandatoryRulesinthePrivateInternationalLawofContracts,
    title = "Application of Mandatory Rules in the Private International Law of Contracts",
    author = "Kerstin Ann Susann {Schäfer}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01170-8",
    url = "https://www.peterlang.com/document/1053614"
}