@book { LeadAgency,
    title = "Lead Agency",
    author = "Martin {Gerner}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03028-0",
    url = "https://www.peterlang.com/document/1047781"
}