Reference:

Samuel Kaski. Computationally efficient approximation of a probabilistic model for document representation in the WEBSOM full-text analysis method. Neural Processing Letters, 5:139–151, 1997.

Suggested BibTeX entry:

@article{Kaski97npl,
    author = {Samuel Kaski},
    journal = {Neural Processing Letters},
    pages = {139-151},
    title = {Computationally Efficient Approximation of a Probabilistic Model for Document Representation in the {WEBSOM} Full-Text Analysis Method},
    volume = {5},
    year = {1997},
}