Ralf Treinen Rewriting Techniques and Applications, 20th International Conference, RTA 2009, Brasília, Brazil, June 29 - July 1, 2009, Proceedings 5595 2009 http://dx.doi.org/10.1007/978-3-642-02348-4 978-3-642-02347-7 RTA Lecture Notes in Computer Science Springer db/conf/rta/rta2009.html