1. United Nations: Convention on the rights of persons with disabilities, http://www2.ohchr.org/english/law/disabilities-convention.html
2. Asociación Facil Lectura: Social space for research and innovation, http://www.lecturafacil.net
3. Simplext: An automatic system for text simplification, http://www.simplext.es
4. Prodis Foundation: Social space for research and innovation, http://www.fundacionprodis.org/
5. Chandrasekar, R., Doran, C., Srinivas, B.: Motivations and methods for text simplification. In: Proceedings of the International Conference on Computational Linguistics, pp. 1041–1044 (1996)