Subject
Mathematics (miscellaneous)
Reference9 articles.
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4. M. P. Schützenberger, “On finite monoids having only trivial subgroups,” Inf. Control 8, 190–194 (1965).
5. I. Simon, “Piecewise testable events,” in Automata Theory and Formal Languages: Proc. 2nd GI Conference, Kaiserslautern, Germany, 1975 (Springer, Berlin, 1975), pp. 214–222.