Reference:

Sami Virpioja. Evaluation methods for unsupervised natural language learning. In Sasu Tarkoma, Joni-Kristian Kämäräinen, and Tapio Pahikkala, editors, Federated Computer Science Event 2012, number B-2012-1 in Department of Computer Science Series of Publications B, pages 66–67, Helsinki, Finland, 2012. Department of Computer Science, University of Helsinki.

Suggested BibTeX entry:

@inproceedings{virpioja2012ytp,
    address = {Helsinki, Finland},
    author = {Sami Virpioja},
    booktitle = {Federated Computer Science Event 2012},
    editor = {Sasu Tarkoma and Joni-Kristian K{\"a}m{\"a}r{\"a}inen and Tapio Pahikkala},
    language = {eng},
    number = {B-2012-1},
    pages = {66--67},
    publisher = {Department of Computer Science, University of Helsinki},
    series = {Department of Computer Science Series of Publications B},
    title = {Evaluation Methods for Unsupervised Natural Language Learning},
    year = {2012},
}