@phdthesis{
    Honkela97thesis,
    author = "Honkela, Timo",
    annote = "URL http://www.cis.hut.fi/$\sim$tho/thesis/",
    school = "Helsinki University of Technology",
    year = "1997",
    address = "Espoo, Finland",
    title = "Self-Organizing Maps in Natural Language Processing"
}