@book { Essstrungen,
    title = "Essstörungen",
    author = "Anja {Winterstein}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638267960",
    url = "https://www.hausarbeiten.de/document/23734"
}