@phdthesis{
    Siivola07,
    author = "Siivola, Vesa",
    school = "Helsinki University of Technology, Dissertations in Computer and Information Science, Report D21",
    title = "Language Models for Automatic Speech Recognition: Construction and Complexity Control",
    url = "http://lib.tkk.fi/Diss/2007/isbn9789512288946/",
    address = "Espoo, Finland",
    year = "2007",
    owner = "MM",
    impactfactor = "G5"
}