@book { Laubfrbung,
    title = "Laubfärbung",
    author = "Schmidt {Sandy}",
    year = "2001",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640002399",
    url = "https://www.hausarbeiten.de/document/101826"
}