1. Aho, A.V.: Nested stack automata. JACM 16(3), 383–406 (1969)
2. Chomsky, N.: Formal properties of grammars. In: Luce, R.D., Bush, R.R., Galanter, E. (eds.) Handbook of Mathematical Psychology, vol. 2. Wiley, New York (1962)
3. Villemonte de la Clergerie, É.: Parsing MCS languages with thread automata. In: Proceedings of TAG+02, pp. 101–108 (2002)
4. Villemonte de la Clergerie, É.: Parsing mildly context-sensitive languages with thread automata. In: Proceedings of COLING 2002, vol. 1, pp. 1–7. ACL (2002)
5. Engelfriet, J.: Context-free grammars with storage. CoRR (2014)