Edwin H. Spanier
Seymour Ginsburg and Edwin H. Spanier.
Quotients of context-free languages.
Journal of the ACM
, 10(4):487-492, October 1963.
References and Citations.
Seymour Ginsburg and Edwin H. Spanier.
Mappings of languages by two-tape devices.
Journal of the ACM
, 12(3):423-434, July 1965.
References.
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