1. Lecture Notes in Computer Science;R. Alur,2007
2. Alur, R., Madhusudan, P.: Visibly pushdown languages. In: STOC, pp. 202–211 (2004)
3. Béal, M.-P., Carton, O., Prieur, C., Sakarovitch, J.: Squaring transducers: an efficient procedure for deciding functionality and sequentiality. TCS 292(1), 45–63 (2003)
4. Blattner, M., Head, T.: Single-valued a-transducers. JCSS 15(3), 310–327 (1977)
5. Comon, H., Dauchet, M., Gilleron, R., Löding, C., Jacquemard, F., Lugiez, D., Tison, S., Tommasi, M.: Tree automata techniques and applications (2007), http://www.grappa.univ-lille3.fr/tata