@article{
    Lagus04.ins,
    author = "Lagus, Krista and Kaski, Samuel and Kohonen, Teuvo",
    title = "Mining massive document collections by the {WEBSOM} method",
    journal = "Information Sciences",
    number = "1--3",
    volume = "163",
    year = "2004",
    pages = "135--156"
}