Indexed Grammars---An Extension of Context-Free Grammars, Journal of the ACM, vol.15, issue.4, pp.647-671, 1968. ,
DOI : 10.1145/321479.321488
Closure properties of certain families of formal languages with respect to a generalization of cyclic closure, RAIRO. Informatique th??orique, vol.15, issue.3, pp.233-252, 1981. ,
DOI : 10.1051/ita/1981150302331
Permutation closures of context-free and indexed languages, 2015. ,
Conjugacy languages in groups, Israel Journal of Mathematics, vol.54, issue.1, pp.311-347, 2016. ,
DOI : 10.1007/s11856-015-1274-5
The IO- and OI-hierarchies, Theoretical Computer Science, vol.20, issue.2, pp.95-207, 1982. ,
DOI : 10.1016/0304-3975(82)90009-3
An automata-theoretical characterization of the OI-hierarchy, Information and Control, vol.71, issue.1-2, pp.1-32, 1986. ,
DOI : 10.1016/S0019-9958(86)80016-X
The number of occurrences of letters versus their distribution in some EOL languages, Information and Control, vol.26, issue.3, pp.256-271, 1974. ,
DOI : 10.1016/S0019-9958(74)91379-5
On inverse homomorphic images of deterministic ETOL languages, Automata, languages, development, pp.179-189, 1976. ,
Introduction to automata theory, languages, and computation, 1979. ,
The cyclic shift of languages, Problemy Pereda?i Informacii, vol.9, issue.4, pp.81-87, 1973. ,
Closure property of the family of context-free languages under the cyclic shift operation, Electron. Commun. Japan, vol.55, issue.4, pp.119-122, 1972. ,
The Book of L, 1986. ,
DOI : 10.1007/978-3-642-95486-3