@book { PathwaysforatransitiontoasustainablehydrogentransportationfuelinfrastructureinCalifornia,
    title = "Pathways for a transition to a sustainable hydrogen transportation fuel infrastructure in California",
    author = "Marlene {Hilkert}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832477387",
    url = "https://m.diplom.de/document/222979"
}