N. Chomsky and M. P. Schützenberger. The algebraic theory of context-free languages. Computer programming and formal systems, edited by P. Braffort and D. Hirschberg, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1963, pp. 118–161.

1967 ◽  
Vol 32 (3) ◽  
pp. 388-389
Author(s):  
G. H. Matthews

1959 ◽  
Vol 24 (3) ◽  
pp. 236-238
Author(s):  
William Craig


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