1. Bar-Hillel Y., Shamir E. (1964). Finite state languages: Formal representations and adequacy problems. In: Bar Hillel Y.(ed) Language and information. Reading, MA: Addison-Wesley, pp. 87–98
2. Boullier, P. (2000). Range concatenation grammars. In Proceedings of Sixth International Workshop on Parsing Technologies (IWPT 2000), pp. 53–64.
3. Boullier P. (2001). From contextual grammars to range concatenation grammars. Electronic Notes in Theoretical Computer Science 53, 1–12
4. Chomsky N. (1963). Formal properties of grammars. In: Luce RD et al. (eds) Handbook of mathematical psychology. New York, John Wiley, pp. 323–418
5. Ehrenfeucht, A., Ilie, L., Păun, Gh., Rozenberg, G., & Salomaa, A. (1995). On the generative capacity of certain classes of contextual grammars. In: Gh. Păun (Ed.), Mathematical linguistics and related topics (pp. 105–118). The Publ. House of the Romanian Academy.