@book { KonsumentenverhalteninMarktnischen,
    title = "Konsumentenverhalten in Marktnischen",
    author = "Tobias {Schäfers}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00732-9",
    url = "https://www.peterlang.com/document/1044323"
}