@PHDTHESIS\{IMM1997-02471,
    author       = "P. S. Hansen",
    title        = "Signal subspace methods for speech enhancement",
    year         = "1997",
    pages        = "214",
    school       = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    type         = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2471-full.html"
}