@book { DieMachtdesGeistes,
    title = "Die Macht des Geistes",
    subtitle = "Festgabe für Norbert Leser zum 70. Geburtstag",
    author = "Erwin {Bader}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095064"
}