Reference:

Matti Pöllä and Timo Honkela. Negative selection of written language using character multiset statistics. Journal of Computer Science and Technology, 25(6):1256–1266, November 2010.

Suggested BibTeX entry:

@article{polla10jcst,
    author = {Matti P{\"o}ll{\"a} and Timo Honkela},
    journal = {Journal of Computer Science and Technology},
    month = {November},
    number = {6},
    pages = {1256--1266},
    publisher = {Springer Boston},
    title = {Negative Selection of Written Language Using Character Multiset Statistics},
    volume = {25},
    year = {2010},
}