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MR609044
(82m:03051)
03D05
(05C99 20F10 68F05)
Muller, David E.; Schupp, Paul E. Context-free languages, groups, the theory of ends, second-order logic, tiling problems, cellular automata, and vector addition systems. Bull. Amer. Math. Soc. (N.S.) 4 (1981), no. 3, 331--334. |
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