@conference {520, title = {A System for the Simplification of Numerical Expressions at Different Levels of Understandability. }, booktitle = {Worshop Natural Language Processing for Improving Textual Accessibility (NLP4ITA)}, year = {2013}, month = {06/2013}, address = {Atlanta, USA}, keywords = {simplification}, attachments = {http://nil.fdi.ucm.es/sites/default/files/nlp4ita_cr.pdf}, author = {Bautista, Susana and Herv{\'a}s, Raquel and Pablo Gerv{\'a}s and Richard Power and Sandra Williams} }