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Olzhas Makhambetov, Aibek Makazhanov, Zhandos Yessenbayev, Bakhyt Matkarimov, Islam Sabyrgaliyev, Anuar Sharafudinov. Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing. 2013.
Makhambetov et al. (Tue,) studied this question.