31 Jesús Herrera Anselmo Peñas Felisa Verdejo Roque Marín Eva Onaindia Alberto Bugarín José Santos 2006 Techniques for Recognizing Textual Entailment and Semantic Equivalence 11th Conference of the Spanish Association for Artificial Intelligence, CAEPIA 2005. Revised Selected Papers Santiago de Compostela, Spain Springer 4177 418--428 Lecture Notes in Artificial Intelligence 10/2006 978-3-540-45914-9 textual entailment recognition semantic equivalence