@CONFERENCE\{IMM2000-01108,
    author       = "H. W. Jensen and N. J. Christensen",
    title        = "A practical guide to global illuminationusing photon maps",
    year         = "2000",
    booktitle    = "{ACM} Siggraph 2000, Course note 8",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1108-full.html"
}