@book { MusikalsLebensprogramm,
    title = "Musik als Lebensprogramm",
    author = "Gottfried {Krieger} and Matthias {Spindler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1089614"
}