María José Escalona Cuaresma Boris Shishkov José Cordeiro ICSOFT 2011 - Proceedings of the 6th International Conference on Software and Data Technologies, Volume 1, Seville, Spain, 18-21 July, 2011 SciTePress 2011 978-989-8425-76-8 ICSOFT (1) db/conf/icsoft/icsoft2011-1.html