@CONFERENCE\{IMM2000-01170,
    author       = "O. Bang and C. B. Clausen and L. Torner",
    title        = "Engineering of effective quadratic and cubic nonlinearities in two-period {QPM} gratings",
    year         = "2000",
    pages        = "147-148",
    booktitle    = "Conference on Lasers and Electro-Optics, {OSA} Technical Digest",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "Optical Society of America",
    organization = "",
    address      = "Washington {DC}",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1170-full.html"
}