@PHDTHESIS\{IMM2000-02367,
    author       = "S. Halkj{\ae}r",
    title        = "Elastic wave propagation in anisotropic inhomogeneous materials",
    year         = "2000",
    pages        = "xvi + 183",
    school       = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    type         = "",
    url          = "http://www.imm.dtu.dk/documents/ftp/phdliste/phd74.abstract-full.html"
}