Elena Navarro Pedro Sánchez Patricio Letelier Juan A. Pastor Isidro Ramos A Goal-Oriented Approach for Safety Requirements Specification. 319-326 2006 conf/ecbs/2006 ECBS http://doi.ieeecomputersociety.org/10.1109/ECBS.2006.7 db/conf/ecbs/ecbs2006.html#NavarroSLPR06