Reference:

Timo Honkela, Mikko Kurimo, Krista Lagus, Vuokko Lantz, and Erkki Oja. Unsupervised learning in human-computer interfaces. In Adjunct Proceedings of Human-Computer Interaction International, pages 121–122, 2003.

Suggested BibTeX entry:

@inproceedings{Honkela2003unsupervisedhci,
    author = {Timo Honkela and Mikko Kurimo and Krista Lagus and Vuokko Lantz and Erkki Oja},
    booktitle = {Adjunct Proceedings of Human-Computer Interaction International},
    pages = {121-122},
    title = {Unsupervised Learning in Human-Computer Interfaces},
    year = {2003},
}

This work is not available online here.