@book { DialectContactandSocialNetworks,
    title = "Dialect Contact and Social Networks",
    author = "Keiko {Hirano}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02782-2",
    url = "https://www.peterlang.com/document/1046413"
}