Josefina Sierra Josefina Santibáñez The Acquisition of Linguistic Competence for Communicating Propositional Logic Sentences. 175-192 2007 ESAW http://dx.doi.org/10.1007/978-3-540-87654-0_9 conf/esaw/2007 db/conf/esaw/esaw2007.html#SierraS07