@book { CollaborativeSystems,
    title = "Collaborative Systems",
    author = "Donald {Neumann}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02026-7",
    url = "https://www.peterlang.com/document/1046191"
}