Reference:

Markus Sadeniemi, Kimmo Kettunen, Tiina Lindh-Knuutila, and Timo Honkela. Complexity of European Union languages: A comparative approach. Journal of Quantitative Linguistics, 15(2):185–211, 2008.

Suggested BibTeX entry:

@article{Sadeniemi08,
    author = {Markus Sadeniemi and Kimmo Kettunen and Tiina Lindh-Knuutila and Timo Honkela},
    journal = {Journal of Quantitative Linguistics},
    number = {2},
    pages = {185--211},
    title = {Complexity of {E}uropean {U}nion Languages: {A} Comparative Approach},
    volume = {15},
    year = {2008},
}