@book { MezzanineCapitalinEurope,
    title = "Mezzanine Capital in Europe",
    subtitle = "With Special Emphasis on Capital Structure",
    author = "Markus Herbert {Tyl}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832461027",
    url = "https://m.diplom.de/document/221566"
}