@book { LaserbearbeitungvonPiezokeramik,
    title = "Laserbearbeitung von Piezokeramik",
    author = "Fredegar {Bönning}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/218080"
}