Arabic Dialect Identification Omar F Zaidan author Chris Callison-Burch author 2014-03 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zaidan-callison-burch-2014-arabic 10.1162/COLI_a_00169 https://aclanthology.org/J14-1006/ 2014-03 40 1 171 202