@book { MusikalischeGrammatikundMusikalischesProblemlsen,
    title = "Musikalische Grammatik und Musikalisches Problemlösen",
    subtitle = "Utrechter Schriften (1970-1974)",
    author = "Nico {Schüler}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097893"
}