@book { Microblogsglobal,
    title = "Microblogs global",
    author = "Torsten {Siever} and Peter {Schlobinski}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03894-1",
    url = "https://www.peterlang.com/document/1045624"
}