@TECHREPORT\{IMM1985-03811,
    author       = "V. V. Vidal and H. Ravn and Z. Nahorski",
    title        = "Stability of upper boundary (perturbation function): an introduction",
    year         = "1985",
    pages        = "100",
    number       = "",
    series       = "",
    institution  = "{IMSOR,} {DTH}",
    address      = "",
    type         = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3811-full.html"
}