@book { SoftwareEngineeringKonzepteinPHPEineUntersuchung,
    title = "Software Engineering Konzepte in PHP: Eine Untersuchung",
    author = "Andreas {Yalcin}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836606554",
    url = "https://m.diplom.de/document/225436"
}