@book { 30TageSonnenschein,
    title = "30 Tage Sonnenschein",
    author = "Jochen {Till}",
    year = "2013",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783955201760",
    url = "https://m.dotbooks.de/document/214611"
}