@book { FerdinandHodlerDerTag,
    title = "Ferdinand Hodler- «Der Tag»",
    subtitle = "Vom Realismus zum Symbolismus",
    author = "Peter {Vignau-Wilberg}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095156"
}