Open Access
May 1981 Context-free languages, groups, the theory of ends, second-order logic, tiling problems, cellular automata, and vector addition systems
David E. Muller, Paul E. Schupp
Bull. Amer. Math. Soc. (N.S.) 4(3): 331-334 (May 1981).
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Vol.4 • No. 3 • May 1981
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