@book { ArnoldSchnbergundRobertoGerhardBriefwechsel,
    title = "Arnold Schönberg und Roberto Gerhard: Briefwechsel",
    author = "Paloma {Ortiz de Urbina}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/b15301",
    url = "https://www.peterlang.com/document/1110910"
}