@book { MetaphorsoftheWeb20,
    title = "Metaphors of the Web 2.0",
    author = "Alexander {Tokar}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00721-3",
    url = "https://www.peterlang.com/document/1054080"
}