@ARTICLE\{IMM1998-0321,
    author       = "O. Bang",
    title        = "Quasi-phase-matching and x(2):x(2) cascading",
    year         = "1998",
    month        = "mar",
    pages        = "13-17",
    journal      = "Australian Optical Society News",
    volume       = "12",
    editor       = "",
    number       = "",
    publisher    = "Australian Optical Society",
    url          = "http://www.imm.dtu.dk/~ob/inv1scan.pdf"
}