Azucena Montes Hasdai Pacheco Hugo Estrada Oscar Pastor Conceptual Model Generation from Requirements Model: A Natural Language Processing Approach. 325-326 2008 NLDB http://dx.doi.org/10.1007/978-3-540-69858-6_32 conf/nldb/2008 db/conf/nldb/nldb2008.html#MontesPEP08