@book { BetriebvonSportundVeranstaltungsimmobilien,
    title = "Betrieb von Sport- und Veranstaltungsimmobilien",
    author = "Louise {Bielzer} and Ronald {Wadsack}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01153-1",
    url = "https://www.peterlang.com/document/1053664"
}