Reference:

Timo Honkela. Self-organizing maps in symbol processing. In Hybrid Neural Systems, pages 348–362. Springer, 2000.

Suggested BibTeX entry:

@incollection{Honkela2000hybrid,
    author = {Timo Honkela},
    booktitle = {Hybrid Neural Systems},
    pages = {348-362},
    publisher = {Springer},
    title = {Self-Organizing Maps in Symbol Processing},
    year = {2000},
}