@book { PlatonsDialogLysis,
    title = "Platons Dialog «Lysis»",
    subtitle = "Ein unlösbares Rätsel?",
    author = "Horst {Peters}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091967"
}