Reference:

Timo Honkela, Krista Lagus, and Samuel Kaski. Self-organizing maps of large document collections. In Guido Deboeck and Teuvo Kohonen, editors, Visual Explorations in Finance with Self-Organizing Maps, pages 168–178. Springer, London, 1998.

Suggested BibTeX entry:

@incollection{Honkela98deboeck,
    address = {London},
    author = {Timo Honkela and Krista Lagus and Samuel Kaski},
    booktitle = {Visual Explorations in Finance with Self-Organizing Maps},
    editor = {Guido Deboeck and Teuvo Kohonen},
    pages = {168-178},
    publisher = {Springer},
    title = {Self-Organizing Maps of Large Document Collections},
    year = {1998},
}