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Verena Lyding, Egon Stemle, Claudia Borghetti, Marco Brunello, Sara Castagnoli, Felice Dell’Orletta, Henrik Dittmann, Alessandro Lenci, Vito Pirrelli. Proceedings of the 9th Web as Corpus Workshop (WaC-9). 2014.
Lyding et al. (Wed,) studied this question.