J. Jiménez, J. Lloret, J. Diaz, and R. Gilaberte. TRIDENTCOM, volume 177 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 124-134. Springer, (2016)
E. Lloret, A. Balahur, M. Palomar, and A. Montoyo. HLT-NAACL (Student Research Workshop and Doctoral Consortium), page 72-77. The Association for Computational Linguistics, (2009)978-1-932432-42-8.