@book { OptionsforVariableCompensation,
    title = "Options for Variable Compensation",
    author = "Nadine {Pahl} and Axel {Hinze} and Anne {Richter}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640298105",
    url = "https://www.hausarbeiten.de/document/124633"
}