@book { GustavMahlerunddieSpiritualitt,
    title = "Gustav Mahler und die Spiritualität",
    author = "Alexander {Odefey}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b10701",
    url = "https://www.peterlang.com/document/1050634"
}