@ARTICLE\{IMM2004-04085,
    author       = "M. Opper and O. Winther",
    title        = "Approximate Inference in Probabilistic Models",
    year         = "2004",
    pages        = "494-504",
    journal      = "Lecture Notes in Artificial Intelligence",
    volume       = "3244",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4085-full.html"
}