@book { ContractingalsInstrumentzurRealisierungvonEnergieeinsparpotentialen,
    title = "Contracting als Instrument zur Realisierung von Energieeinsparpotentialen",
    author = "Michael {Schulz}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832451608",
    url = "https://m.diplom.de/document/220687"
}