@CONFERENCE\{IMM2001-0432,
    author       = "P. Belotti and T. Stidsen",
    title        = "Optimal Placement of Wavelength Converting Nodes",
    year         = "2001",
    month        = "nov",
    keywords     = "Optical Networks, Linear Programming, Wavelength Converting Nodes",
    booktitle    = "Third International Workshop on Design of Reliable Communcation Networks",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/432-full.html",
    abstract     = "The all optical network using {WDM} and optical nodes (OXC's) seems to
be a possibility in a near future. The consensus to day seems to be
that optical wavelength conversions is un-realistic for several
decades, hence wavelength blocking will happen in the all optical
networks. A possible solution to this problem could be to include
digital nodes (DXC's) in the network at the right places.  In this
article we present a linear programming model which optimizes the
placement of these more expensive {DXC'}s in the network."
}