@book { RealOptions,
    title = "Real Options",
    subtitle = "Ein auf den Optionspreistheorien basierender Ansatz zur Investitionsplanung",
    author = "Dirk {Wehling}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832404345",
    url = "https://m.diplom.de/document/216405"
}