Reference:

Krista Lagus, Timo Honkela, Samuel Kaski, and Teuvo Kohonen. WEBSOM for textual data mining. Artificial Intelligence Review, 13(5/6):345–364, December 1999.

Suggested BibTeX entry:

@article{Lagus99,
    author = {Krista Lagus and Timo Honkela and Samuel Kaski and Teuvo Kohonen},
    journal = {Artificial Intelligence Review},
    month = {December},
    number = {5/6},
    pages = {345-364},
    title = {{WEBSOM} for Textual Data Mining},
    volume = {13},
    year = {1999},
}