@book { ImplementationofadeclarativequeryanddatamanipulationlanguageforXRay,
    title = "Implementation of a declarative query and data manipulation language for X-Ray",
    author = "Christian {Hiebl}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832475802",
    url = "https://m.diplom.de/document/222857"
}