@book { VirtualEnvironmentsandCultures,
    title = "Virtual Environments and Cultures",
    author = "Undine {Frömming}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03541-4",
    url = "https://www.peterlang.com/document/1046618"
}