@book { Guidingofelectromagneticenergyinsubwavelengthperiodicmetalstructures,
    title = "Guiding of electromagnetic energy in subwavelength periodic metal structures",
    author = "Stefan {Maier}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/222017"
}