Affiliation: | Faculty of Mathematics and Computer Science, University of Bucharest, Str. Academiei 14, 70109, Bucharest, Romania;Research Group on Mathematical Linguistics, Rovira i Virgili University, Pça Imperial Tàrraco 1, 43005 Tarragona, Spain;Faculty of Mathematics and Computer Science, University of Bucharest, Str. Academiei 14, 70109, Bucharest, Romania;Research Group on Mathematical Linguistics, Rovira i Virgili University, Pça Imperial Tàrraco 1, 43005 Tarragona, Spain |