@book { GustavMahlersMentalWorld,
    title = "Gustav Mahler’s Mental World",
    author = "Constantin {Floros}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06401-8",
    url = "https://www.peterlang.com/document/1067676"
}