Readability Indices for Automatic Evaluation of Text Simplification Systems: A Feasibility Study for Spanish Sanja Štajner author Horacio Saggion author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication stajner-saggion-2013-readability https://aclanthology.org/I13-1043/ 2013-10 374 382