1. Albert, P., Mayordomo, E., Moser, P.: Bounded pushdown dimension vs lempel ziv information density. Technical Report TR07-051, ECCC: Electronic Coloquium on Computational Complexity (2007)
2. Albert, P., Mayordomo, E., Moser, P., Perifel, S.: Pushdown compression. In: Proceedings of the 25th Symposium on Theoretical Aspects of Computer Science (STACS 2008), pp. 39–48 (2008)
3. Alon, N., Matias, Y., Szegedy, M.: The space complexity of approximating the frequency moments. Journal of Computer and System Sciences 58, 137–147 (1999)
4. Lecture Notes in Computer Science;R. Alur,2006
5. Autebert, J., Berstel, J., Boasson, L.: Context-free languages and pushdown automata. In: Rozenberg, G., Salomaa, A. (eds.) Handbook of Formal Languages, Word, Language, Grammar, vol. 1, pp. 111–174. Springer, Heidelberg (1997)