@book { DirectorsDealingsamdeutschenKapitalmarkt,
    title = "Directors` Dealings am deutschen Kapitalmarkt",
    author = "Martin H. {Schmidt}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836642521",
    url = "https://m.diplom.de/document/227593"
}