@book { MitleidsEthikbeiArthurSchopenhauer,
    title = "Mitleids-Ethik bei Arthur Schopenhauer",
    author = "Peter {Gruber}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656511342",
    url = "https://www.hausarbeiten.de/document/262246"
}